Supplementary cash flow disclosure: Supplemental Cash Flow Information [Abstract] Customer [Domain] Customer [Domain] Legal Proceedings and Commitments and Contingencies Legal Matters and Contingencies [Text Block] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) State Current State and Local Tax Expense (Benefit) Awards vested (in shares) Performance shares vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Leasehold improvements Leasehold Improvements [Member] Acquisition related costs Business Combination, Acquisition Related Costs Settlement and Termination Derivative Contract Settlement And Termination Derivative contract settlement and termination. Cash dividends Dividends, Common Stock, Cash Security Exchange Name Security Exchange Name Awards forfeited (in dollars per share) Performance shares forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Beginning balance Ending balance Guaranteed Deposit Accounts, Amount Guaranteed Deposit Accounts, Amount Other accrued liabilities Liability, Defined Benefit Plan, Current Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Accrued Liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Accrued Liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Accrued Liabilities Derivative Instruments Designated as Cash Flow Hedges Derivatives, Policy [Policy Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Operating Lease, Liability, to be Paid, Sublease Arrangements Operating Lease, Liability, to be Paid, Sublease Arrangements Operating Lease, Liability, to be Paid, Sublease Arrangements Operating Lease, Lease Income Operating Lease, Lease Income Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 2024 Long-Term Debt, Maturity, Year Two Purchased intangible assets Deferred Tax Liabilities, Intangible Assets IncomeTaxReconciliationDeductionsFDII IncomeTaxReconciliationDeductionsFDII Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign derived intangible income deductions. Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Goodwill, Purchase Accounting Adjustments Goodwill, Purchase Accounting Adjustments Subsequent Event Type Subsequent Event Type [Domain] Amortization expense related to intangible assets Amortization of Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Settlements Defined Benefit Plan, Benefit Obligation, Payment for Settlement Additions for tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Net deferred tax assets Deferred Tax Assets, Net Diluted EPS impact (in dollars per share) Increase Decrease In Income From Change In Contract Estimates Per Diluted Share Increase (decrease) in income from change in contract estimates per diluted share. Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Sale of receivables TransferOfFinancialAssetsAccountedForAsSalesReceivablesSoldDuringPeriod TransferOfFinancialAssetsAccountedForAsSalesReceivablesSoldDuringPeriod Antidilutive stock options excluded (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Second Amendmente to the Third Amended Credit Agreement Second Amendmente to the Third Amended Credit Agreement [Member] Second Amendment to the Third Amended Credit Agreement [Member] Vesting stock awards Vesting stock awards Vesting Stock Awards [Member] Vesting stock awards. Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Business Acquisition [Axis] Business Acquisition [Axis] Finite Lived Intangible Assets, Gross Carrying Value, Fully Amortized Finite Lived Intangible Assets, Gross Carrying Value, Fully Amortized Finite Lived Intangible Assets, Gross Carrying Value, Fully Amortized Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Adjustments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Adjustments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Adjustments Award Type [Domain] Award Type [Domain] Local Phone Number Local Phone Number Outstanding obligations Guarantor Obligations, Current Carrying Value Weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options exercisable, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Increase to cash flows from operating activities Transfer of Financial Assets Account For As Sales, Increase (Decrease) In Cash Flows From Operating Activities Transfer of Financial Assets Account For As Sales, Increase (Decrease) In Cash Flows From Operating Activities Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Finite-lived Intangible Assets Acquired Finite-lived Intangible Assets Acquired Distributions to non-controlling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Asset (Liability) Fair Value Derivative Assets (Liabilities), at Fair Value, Net Retained earnings Retained Earnings [Member] Receivables, net Trade Accounts Receivable [Member] Ownership percentage Noncontrolling Interest, Ownership Percentage by Parent Term Loan A Facility Commitment Due October Two Thousand Twenty Three Term Loan A Facility Due October Two Thousand Twenty Three [Member] Term Loan A Facility Due October Two Thousand Twenty Three Receivables Increase (Decrease) in Accounts Receivable Impairment of assets Operating Lease, Right-of-Use Asset, Impairment Operating Lease, Right-of-Use Asset, Impairment Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Stock-based Compensation Compensation Related Costs, Policy [Policy Text Block] Pay Fixed Rate Derivative, Fixed Interest Rate Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Basic (in dollars per share) Earnings Per Share, Basic Principal amount of long-term debt, current Debt Instrument Current Carrying Amount Debt instrument current carrying amount. Revenues Revenue from Contract with Customer [Text Block] Sublease Income Sublease Income Unvested awards, beginning balance (in shares) Unvested awards, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2023 Long-Term Debt, Maturity, Year One Percentage of awards presented for target number of shares Percentage Of Awards Presented For Target Number Of Shares Percentage of awards presented for target number of shares. Capitalized contract cost, net Capitalized Contract Cost, Net Net deferred tax (liabilities) assets Deferred Tax Liabilities, Net Total restructuring costs and impairment Restructuring Costs and Asset Impairment Charges Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Payroll And Employee Benefits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Payroll And Employee Benefits Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accrued payroll and employee benefits. Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Entity Voluntary Filers Entity Voluntary Filers Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Plan Name Plan Name [Axis] Total long-term debt Long-term Debt Fixed income Fixed Income Funds [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Impairment of goodwill Goodwill, Impairment Loss Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee stock purchase plan. Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] State income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Entity Small Business Entity Small Business Base Rate Base Rate [Member] Additions for tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Defined Benefit Plan, Equity Securities, Non-US Defined Benefit Plan, Equity Securities, Non-US [Member] Goodwill, Period Increase (Decrease) Goodwill, Period (Increase) Decrease Goodwill, Period Increase (Decrease) Excess tax benefits for stock-based compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount Non-Strategic International Operations Non-Strategic International Operations [Member] Non-Strategic International Operations LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Unrecognized tax benefits that, if recognized, would affect the effective income tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Interest Rate Swaps Interest Rate Swap [Member] Changes in Accumulated Other Comprehensive Income Attributable to the Company's Fixed Interest Rate Swap Cash Flow Hedges Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current Thereafter Long-Term Debt, Maturity, after Year Five 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Lease liability Deferred Tax Assets, Operating Lease, Liability Deferred Tax Assets, Operating Lease, Liability Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Including Goodwill Basic EPS impact (in dollars per share) Increase Decrease In Income From Change In Contract Estimates Per Basic Share Increase (decrease) in income from change in contract estimates per basic share. Contractor [Domain] Contractor [Domain] [Domain] for Contractor [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Comprehensive income attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Unrecognized tax benefits at beginning of the year Unrecognized tax benefits at end of the year Unrecognized Tax Benefits Total deferred tax assets Deferred Tax Assets, Gross Income Tax Authority Income Tax Authority [Domain] Operating Cycle Construction Contractor, Operating Cycle [Policy Text Block] Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Entity Address, State or Province Entity Address, State or Province Current liabilities: Liabilities, Current [Abstract] Valuation allowance Operating Loss Carryforwards, Valuation Allowance Defined benefit plan liability Net amount recognized Liability, Defined Benefit Plan Restructuring Plan [Domain] Restructuring Plan [Domain] Options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Sales of Receivables TransfersOfFinancialAssetsAccountedForAsSalesMarpa [Text Block] TransfersOfFinancialAssetsAccountedForAsSalesMarpa [Text Block] Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Accounting Policies [Abstract] Accounting Policies [Abstract] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Derivative Instrument Derivative Instrument [Axis] Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share Repurchase Plan Stock Repurchase Plan [Member] Stock repurchase plan. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Operating Lease, Liability Operating Lease, Liability Federal Current Federal Tax Expense (Benefit) Document Transition Report Document Transition Report Common stock, $0.0001 par value, 1 billion shares authorized, 56 million shares and 58 million shares issued and outstanding as of January 28, 2022 and January 29, 2021, respectively Common Stock, Value, Issued Expected weighted-average period of recognition, years Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Shares repurchased under the repurchase plan (in shares) Stock Repurchased And Retired Under Authorization Stock repurchased and retired under authorization. Customer Concentration Risk Customer Concentration Risk [Member] Unvested awards beginning balance (in dollars per share) Unvested awards ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Equity Equity Funds [Member] Leases Lessee, Operating Leases [Text Block] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document and entity information. Unfunded status Defined Benefit Plan, Funded (Unfunded) Status of Plan Acquisitions Business Combination Disclosure [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Weighted Average Grant Date Fair Value and Assumptions Used to Determine Fair Value of Stock Options Granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Net favorable adjustments Increase Decrease In Income From Change In Contract Estimates Increase (decrease) in income from change in contract estimates. Ownership [Axis] Ownership [Axis] Dilutive common share equivalents - stock options and other stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Class of Stock [Axis] Class of Stock [Axis] Marketable Securities, Policy Marketable Securities, Policy [Policy Text Block] Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Income Tax Authority Income Tax Authority [Axis] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Cash dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Revenues Revenue from Contract with Customer, Excluding Assessed Tax Stock awards Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) Stock options Employee Stock Option Share-based Payment Arrangement, Option [Member] Government Investigations and Reviews Government Investigations And Reviews [Member] Government investigations and reviews. Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Variable Rate Variable Rate [Axis] Business Segment Information Segment Reporting Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Variable Rate Variable Rate [Domain] Additional paid-in capital Additional Paid-in Capital [Member] Principal payments on borrowings Repayments of Debt Five subsequent fiscal years Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Acquisition and Integration Costs Acquisition and Integration Costs [Member] Acquisition and Integration Costs Cash dividends paid per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Long-term Debt, Type Long-term Debt, Type [Domain] Term Loan B2 Facility due March 2027 Term Loan B2 Facility Due March Two Thousand Twenty Seven [Member] Term Loan B2 Facility Due March Two Thousand Twenty Seven [Member] Revenues Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Proceeds from lines of credit Proceeds from Lines of Credit Other assets Other Assets [Member] Non-deductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Other (income) expense, net Other Nonoperating Income (Expense) Other Payments for (Proceeds from) Other Investing Activities Repurchases of stock, (in shares) Stock Repurchased and Retired During Period, Shares Business Combinations [Abstract] Business Combinations [Abstract] Term Loan B Facility Due October Two Thousand Twenty Five Term Loan B Facility Due October Two Thousand Twenty Five [Member] Term Loan B Facility Due October Two Thousand Twenty Five [Member] Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Loss Contingency, Nature Loss Contingency, Nature [Domain] Award Type [Axis] Award Type [Axis] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Total common stockholders' equity Stockholders' Equity Attributable to Parent Restructuring and Related Cost, Expected Cost Remaining Restructuring and Related Cost, Expected Cost Remaining City Area Code City Area Code Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Percentage of stock awards vest or exercisable after two years Percentage Of Stock Awards Vest Or Exercisable After Two Years Percentage of stock awards vest or exercisable after two years. Restricted cash included in other current assets Restricted Cash and Cash Equivalents, Current Options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Stock repurchased and retired or withheld for taxes on equity awards Payments for Repurchase of Common Stock Estimated useful lives (in years) Property, Plant and Equipment, Useful Life Equity: Stockholders' Equity Attributable to Parent [Abstract] Contract with customer, performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Credit agreement financial covenant, leverage ratio Ratio Of Indebtedness To Earnings Before Interest Taxes Depreciation And Amortization Ratio of indebtedness to earnings before interest taxes depreciation and amortization. Operating lease liabilities Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Debt instrument, face amount Debt Instrument, Face Amount Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Business Combination, Separately Recognized Transactions Business Combination, Separately Recognized Transactions [Table Text Block] Debt Issuance Costs, Interest Expense Debt Issuance Costs, Interest Expense Debt Issuance Costs, Interest Expense Tax benefits recognized from stock-based compensation Share-based Payment Arrangement, Expense, Tax Benefit Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Increase in number of shares authorized to be repurchased under the repurchase plan (in shares) Stock Repurchase Program Increase In Number Of Shares Authorized To Be Repurchased Stock repurchase program increase in number of shares authorized to be repurchased. Accrued payroll and other employee benefits Other Employee-related Liabilities, Current Accumulated other comprehensive loss Deferred Tax Assets, Other Comprehensive Loss Actual investment return in excess of expected return Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Billed and billable receivables, net Billed Contracts Receivable Total deferred tax liabilities Deferred Tax Liabilities, Gross Business Acquisition [Line Items] Business Acquisition [Line Items] Vesting after two years Share-based Payment Arrangement, Tranche Two [Member] Share Repurchase Program Share Repurchase Program [Axis] Schedule of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Entity Registrant Name Entity Registrant Name Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Contractor [Axis] Contractor [Axis] Contractor [Axis] OtherSupplementalLeaseInformation [Table Text Block] OtherSupplementalLeaseInformation [Table Text Block] saic_OtherSupplementalLeaseInformation [Table Text Block] Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Provision for income taxes Total Income Tax Expense (Benefit) Remaining sold receivables TransferOfFinancialAssetsAccountedForAsSalesRemainingSoldReceivables TransferOfFinancialAssetsAccountedForAsSalesRemainingSoldReceivables 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Receivables, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Term Loan B Facility due October 2025 February 2019 Credit Facility, Term Loan B [Member] February 2019 Credit Facility, Term Loan B [Member] Entity Tax Identification Number Entity Tax Identification Number Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Distributions to non-controlling interest Proceeds from (Payments to) Noncontrolling Interests Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, to be Paid Awards forfeited (in shares) Performance shares forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Retiree Health Reimbursement Account Plan [Member] Retiree Health Reimbursement Account Plan [Member] Retiree Health Reimbursement Account Plan [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Long-term debt, current portion Less current portion Long-term Debt, Current Maturities Property, Plant and Equipment, Type Long-Lived Tangible Asset [Domain] Reconciliation of Weighted Average Number of Shares Outstanding Used to Compute Basic and Diluted EPS Schedule of Weighted Average Number of Shares [Table Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Restructuring Plan [Axis] Restructuring Plan [Axis] Sales Revenue, Net Revenue Benchmark [Member] Weighted-average grant-date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Component [Domain] Equity Component [Domain] Performance shares adjustment (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustment Share based compensation arrangement by share based payment award equity instruments other than options adjustment. 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Disposal Group Name [Domain] Disposal Group Name [Domain] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Debt Issuance Costs, Gross Debt Issuance Costs, Gross Marketable Securities, Noncurrent Marketable Securities, Noncurrent Impairment of Intangible Assets, Finite-lived Impairment of Intangible Assets, Finite-lived Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Unamortized debt issuance costs, non current Debt Issuance Costs, Noncurrent, Net Restructuring and Related Cost, Incurred Cost Restructuring and Related Cost, Incurred Cost Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Stock-Based Compensation and Related Tax Benefits Share-based Payment Arrangement, Cost by Plan [Table Text Block] 2026 Lessee, Operating Lease, Liability, to be Paid, Year Four Guaranteed deposit account Guaranteed Deposit Account [Member] Guaranteed Deposit Account [Member] Time and materials (T&M) Time-and-materials Contract [Member] Payments to Acquire Marketable Securities Payments to Acquire Marketable Securities Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Type of Adoption [Domain] Accounting Standards Update [Domain] Research and development and other federal credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Contract liabilities Contract with Customer, Liability, Noncurrent Auditor Location Auditor Location Transfers Of Financial Assets Accounted For As Sales, Marpa [Table Text Block] Transfers Of Financial Assets Accounted For As Sales, Marpa [Table Text Block] Transfers Of Financial Assets Accounted For As Sales, Marpa [Table Text Block] Income Taxes [Table] Income Taxes [Table] Income taxes. Segment Reporting [Abstract] Segment Reporting [Abstract] Type of Restructuring [Domain] Type of Restructuring [Domain] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Use of Estimates Use of Estimates, Policy [Policy Text Block] Title of 12(b) Security Title of 12(b) Security Deferred income taxes Deferred Income Taxes and Tax Credits Common stock, shares authorized (in shares) Common Stock, Shares Authorized Repayments of Secured Debt Repayments of Secured Debt Title of Individual Title of Individual [Axis] Document Type Document Type Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Net income attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Revolving Credit Facility Revolving Credit Facility [Member] Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Geographical [Axis] Geographical [Axis] Interest cost effective rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate State State and Local Jurisdiction [Member] Vesting [Domain] Vesting [Domain] Cost of revenues Cost of Revenue Business Acquisition, Goodwill, Expected Tax Deductible Amount Business Acquisition, Goodwill, Expected Tax Deductible Amount Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Term Loan A2 Facility Due October Two Thousand Twenty Three Term Loan A2 Facility Due October Two Thousand Twenty Three [Member] Term Loan A2 Facility Due October Two Thousand Twenty Three Computation Of Earnings Per Share [Line Items] Computation Of Earnings Per Share [Line Items] Computation of earnings per share. Concentration Risk Type Concentration Risk Type [Axis] Acquisition and integration costs Business Combination Acquisition And Integration Related Costs This element represents acquisition-related and integration related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; including costs of registering and issuing debt and equity securities; business integration costs, systems integration and conversion costs, and severance and other employee-related costs. Post-Combination Expense Post-Combination Expense Post-Combination Expense Amount of progress payments received are offset against unbilled receivables Government Contract Receivable, Progress Payment Offset 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Surety Bonds Surety Bond [Member] Senior Notes due April 2028 Senior Notes Due April Two Thousand Twenty Eight [Member] Senior Notes Due April Two Thousand Twenty Eight [Member] Business Combinations Business Combinations Policy [Policy Text Block] Outstanding payments Oustanding Checks Oustanding Checks Derivative [Table] Derivative [Table] Document Period End Date Document Period End Date Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Shares authorized to be repurchased under the repurchase plan (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Halfaker and Associates, LLC Halfaker and Associates, LLC [Member] Halfaker and Associates, LLC Fair Value, Inputs, Level 1, 2 and 3 Fair Value, Inputs, Level 1, 2 and 3 [Member] Fixed Income Securities Fixed Income Securities [Member] Shares of stocks under stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] State Deferred State and Local Income Tax Expense (Benefit) Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Costs To Obtain Costs To Obtain [Member] Costs To Obtain Property, plant, and equipment, net Property, plant, and equipment, net Property, Plant and Equipment, Net Schedule of Estimated Annual Amortization Expense Related To Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Reporting Periods Fiscal Period, Policy [Policy Text Block] Principal payments on borrowings Repayments of Long-term Debt Earnings Per Share [Abstract] Earnings Per Share [Abstract] Line of Credit Facility, Annual Principal Payment Line of Credit Facility, Annual Principal Payment Property, plant, and equipment Property, Plant and Equipment, Gross Allowance for doubtful accounts receivable Accounts Receivable, Allowance for Credit Loss Revenue, remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage 2013 Equity Incentive Plan Two Thousand And Thirteen Equity Incentive Plan [Member] Two thousand and thirteen equity incentive plan. Business Combination, Provision For Off-Market Customer Contracts Business Combination, Provision For Off-Market Customer Contracts Business Combination, Provision For Off-Market Customer Contracts Estimated net amounts to be refunded for potential adjustments Loss Contingency Accrual Outstanding beginning balance (in dollars per share) Outstanding ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Letters of Credit Financial Standby Letter of Credit [Member] Entity Current Reporting Status Entity Current Reporting Status Plan assets, amount Fair value of plan assets at beginning of year Fair value of plan assets at end of year Defined Benefit Plan, Plan Assets, Amount Weighted-average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable and Accrued Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountPayableandAccruedLiabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountPayableandAccruedLiabilities Expected contribution amount Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Amortization of Debt Issuance Costs Amortization of Debt Issuance Costs Proceeds from Sale and Maturity of Marketable Securities Proceeds from Sale and Maturity of Marketable Securities Performance shares adjustment (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustment In Period Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award equity instruments other than options adjustment in period weighted average grant date fair value. UNITED STATES UNITED STATES Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant accounting policies. Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Debt Covenant Period [Axis] Debt Covenant Period [Axis] Debt Covenant Period [Axis] Leases [Abstract] Leases [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Auditor Information [Abstract] Auditor Information Entity Address, Postal Zip Code Entity Address, Postal Zip Code Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Diluted weighted-average number of shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Income Taxes Income Tax Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Interest rate margin under credit agreement Debt Instrument, Basis Spread on Variable Rate Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other Restructuring Costs Other Restructuring Costs Credit Facility Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Description Entity Address, Address Line One Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Cost reimbursement Cost Reimbursement Contract [Member] Cost Reimbursement Contract [Member] Entity Shell Company Entity Shell Company Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Current Fiscal Year End Date Current Fiscal Year End Date Interest rate swap 2 Interest Rate Swap, Number Two [Member] Interest Rate Swap, Number Two [Member] Statement [Table] Statement [Table] Accounting Standards Updates New Accounting Pronouncements, Policy [Policy Text Block] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Unrecognized compensation cost, net of estimated forfeitures Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Receive Variable Rate Debt Instrument, Description of Variable Rate Basis Income tax effect Change In Contract Estimates Income Tax Effect Change in contract estimates income tax effect. Statistical Measurement [Axis] Statistical Measurement [Axis] Below threshold level of performance (in shares) Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Lower Than Minimum Performance The minimum percentage of target number of shares to be issued. Subsequent Event Subsequent Event [Member] Intangible assets, net Net carrying value Finite-Lived Intangible Assets, Net Goodwill Goodwill Goodwill Defined Benefit Plan, Cash and Cash Equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Non-controlling interest Stockholders' Equity Attributable to Noncontrolling Interest Measured at NAV Fair Value Measured at Net Asset Value Per Share [Member] Subsequent Event Type Subsequent Event Type [Axis] Operating Lease, Cost Operating Lease, Cost Computer equipment Computer Equipment [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Defined Benefit Obligation Adjustment(2) Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Maximum commitment TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaximumCommitment TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaximumCommitment Income Taxes [Line Items] Income Taxes [Line Items] Income taxes. Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Earnings Per Share (EPS) Earnings Per Share, Policy [Policy Text Block] Integration related costs Business Combination, Integration Related Costs Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income attributable to common stockholders Net Income (Loss) Attributable to Parent Receivables Receivable [Policy Text Block] Operating lease right of use assets Operating Lease, Right-of-Use Asset Pension and Defined Benefit Plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Unfavorable adjustments Decrease In Income From Change In Contract Estimates Decrease in income from change in contract estimates. Interest cost Defined Benefit Plan, Interest Cost Income Statement Location [Axis] Income Statement Location [Axis] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Sales Guaranteed Deposit Account, Decrease From Sales Guaranteed Deposit Account, Decrease From Sales Percentage of market price for employee purchase program for stock purchases during non-compensatory period Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Restructuring Type [Axis] Restructuring Type [Axis] Depreciation or amortization method Property, Plant and Equipment, Depreciation Methods Other assets Other Assets, Noncurrent Third Term Third Term [Member] Third term. Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Retirement Benefits [Abstract] Retirement Benefits [Abstract] Entity File Number Entity File Number Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Amortization rate Debt Instrument, Amortization Rate Debt Instrument, Amortization Rate Options forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Schedule of Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Schedule of Indefinite-lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Payments of financing fees Payments of Financing Costs Other current assets Other Current Assets [Member] Variable Lease, Cost Variable Lease, Cost Term Loan A Facility due October 2023 February 2019 Credit Facility, Term Loan A [Member] February 2019 Credit Facility, Term Loan [Member] Net losses from change in net benefit obligation Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Fair value of vesting awards that vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Awards granted (in dollars per share) Performance shares granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Performance Share Award Activity Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block] Relationship to Entity Title of Individual [Domain] Disposal Group Name [Axis] Disposal Group Name [Axis] Deferred revenue Deferred Tax Assets, Contract With Customer, Liability Deferred Tax Assets, Contract With Customer, Liability Other long-term liabilities Liability, Defined Benefit Plan, Noncurrent Share Repurchase Program Share Repurchase Program [Domain] Credit Facility Credit Facility [Domain] ASSETS Assets [Abstract] Impairment of goodwill and intangible assets Goodwill and Intangible Asset Impairment 2025 Long-Term Debt, Maturity, Year Three Land Land [Member] Vested and expected to vest in the future (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Percentage of stock awards vest or exercisable after one year Percentage Of Stock Awards Vest Or Exercisable After One Year Percentage of stock awards vest or exercisable after one year. Koverse Koverse [Member] Koverse Derivative Instruments Designated as Cash Flow Hedges Derivative Instruments and Hedging Activities Disclosure [Text Block] Awards granted (in shares) Performance shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restructuring Costs Restructuring Costs Restructuring Costs Percentage of sales Concentration Risk, Percentage After July 31, 2016 Second Term [Member] Second term. Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Benefit obligation, discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Trade Names Trade Names [Member] Debt Instrument [Axis] Debt Instrument [Axis] Inventory, prepaid expenses, and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Unbilled receivables, maximum expected period for billing and collection Expected Period For Revenues To Be Billed And Collected On Uncompleted Contracts Maximum expected period for billing and collection of unbilled receivables. Subcontractor to federal government Subcontractor [Member] Subcontractor [Member] Optimization and Consolidated Of Facilities Optimization and Consolidated Of Facilities [Member] Optimization and Consolidated Of Facilities Repurchases of stock Stock Repurchased and Retired During Period, Value Secured Debt Secured Debt [Member] Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Schedule of Unaudited Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Target allocation, percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Unrealized loss from accumulated other comprehensive loss Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Number of operating segments Number of Operating Segments (Gain) loss on divestitures Gain (Loss) on Disposition of Business 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Third Amended Credit Agreement Third Amended Credit Agreement [Member] Third Amended Credit Agreement [Member] Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Prepaid expenses Prepaid Expense, Current Other Other Contractor [Member] Other Contractor [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 2027 Long-Term Debt, Maturity, Year Five Cash collections TransfersOfFinancialAssetsAccountedForAsSalesCashCollected TransfersOfFinancialAssetsAccountedForAsSalesCashCollected Company contributions to defined contribution plans expense Defined Contribution Plan, Cost Shares of stock under stock awards Shares of stock under performance shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Operating Lease, Payments Operating Lease, Payments Shares authorized under plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Research and Development Research and Development Expense, Policy [Policy Text Block] Interest rate swap 1 Interest Rate Swap, Number One [Member] Interest Rate Swap, Number One [Member] Total principal payments Principal amount of long-term debt Long-term Debt, Gross Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Total liabilities and stockholders' equity Liabilities and Equity Other accrued liabilities Other Accrued Liabilities, Current Accrued vacation and bonuses Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Net unrealized gain (loss) on derivative instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Net operating loss and other carryforwards Deferred Tax Assets Operating Loss Carry Forward And Tax Credits Carry Forward Deferred tax assets operating loss carry forward and tax credits carry forward. Vesting after one year Share-based Payment Arrangement, Tranche One [Member] Operating lease assets and liabilities, net Increase (Decrease) In Operating Lease Assets and Liabilities, Net Increase (Decrease) In Operating Lease Assets and Liabilities, Net 2027 Lessee, Operating Lease, Liability, to be Paid, Year Five Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Tax benefits from exercises of stock options Share-based Payment Arrangement, Exercise of Option, Tax Benefit Derivative [Line Items] Derivative [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating Lease, Impairment Loss Operating Lease, Impairment Loss Earnings Per Share, Share Repurchases and Dividends Earnings Per Share [Text Block] 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Minimum Minimum [Member] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Unamortized debt issuance costs, current Debt Issuance Costs, Current, Net Selling, general and administrative expenses Selling, General and Administrative Expense Unamortized debt issuance costs Debt Issuance Costs, Net Debt Issuance Costs, Net Options forfeited or expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Payroll tax deferral Deferred Tax Assets, Payroll Tax Deferral Deferred Tax Assets, Payroll Tax Deferral Percentage of stock awards vest or exercisable after four years Percentage Of Stock Awards Vest Or Exercisable After Four Years Percentage of stock awards vest or exercisable after four years. Other comprehensive loss before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Percentage of stock awards vest or exercisable after three years Percentage Of Stock Awards Vest Or Exercisable After Three Years Percentage of stock awards vest or exercisable after three years. 2026 Long-Term Debt, Maturity, Year Four Issuances of stock Stock Issued During Period, Value, New Issues Restricted cash included in other assets Restricted Cash and Cash Equivalents, Noncurrent Fourth Term Fourth Term [Member] Fourth Term [Member] Cash paid for acquisitions, net of cash acquired Payments to acquire businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Debt Obligations Debt Disclosure [Text Block] Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Other Restructuring Other Restructuring [Member] Line of Credit Line of Credit [Member] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Oustanding amount TransferOfFinancialAssetsAccountedForAsSalesAmountOutstanding TransferOfFinancialAssetsAccountedForAsSalesAmountOutstanding Significant Unobservable Inputs (Level 3) Level 3 Fair Value, Inputs, Level 3 [Member] Collective trust - fixed income Defined Benefit Plan, Common Collective Trust [Member] Dividend payments to stockholders Payments of Ordinary Dividends, Common Stock Lessee, Leases Lessee, Leases [Policy Text Block] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Earnings Per Share [Table] Earnings Per Share [Table] Earnings per share. Issuances of stock, (in shares) Stock Issued During Period, Shares, New Issues Number of reportable segments Number of Reportable Segments Principal amount of long-term debt, non current Debt Instrument Non Current Carrying Amount Debt instrument non current carrying amount. Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Other federal government agencies Other Federal Government Agencies [Member] Other Federal Government Agencies [Member] Goodwill, Acquired During Period Goodwill, Acquired During Period Principles of Consolidation and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance share awards Performance Shares [Member] Commitments and contingencies (Note 17) Commitments and Contingencies Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Increase in projected benefit obligation from decrease in discount rate Defined Benefit Plan, Benefit Obligation, Increase (Decrease) For Discount Rate Change Defined Benefit Plan, Benefit Obligation, Increase (Decrease) For Discount Rate Change Debt issuance costs Deferred financing fees Payments of Debt Issuance Costs Receivables [Abstract] Proceeds from borrowings Proceeds from Issuance of Debt Subtotal Defined Benefit Plan, Mutual Fund and Guaranteed Deposit Account [Member] Defined Benefit Plan, Mutual Fund and Guaranteed Deposit Account [Member] Auditor Name Auditor Name Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Backlog Backlog [Member] Backlog Accrued vacation Accrued Vacation, Current Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Payments for Restructuring Payments for Restructuring Shares of common stock Common Stock [Member] Operating income Operating Income (Loss) Commercial, state and local Commercial, State, And Local Agencies [Member] Commercial, State, And Local [Member] Operating Lease, Liability, Current Operating Lease, Liability, Current Business Overview and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Number of stock based compensation plans Number Of Stock-Based Compensation Plans Number Of Stock-Based Compensation Plans Stock-based compensation expense Total stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Restructuring and Impairment Restructuring and Related Activities Disclosure [Text Block] Share awards granted upon future achievement (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Contingently Issuable Shares Share-based compensation arrangement by share-based payment award, equity instruments other than options, contingently issuable shares. Integration of Engility Integration of Engility [Member] Integration of Engility [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Developed technology Technology-Based Intangible Assets [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiabilities Cash paid for income taxes Income Taxes Paid Total impairment of assets Asset Impairment Charges Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Derivative, Notional Amount Derivative, Notional Amount Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Expenditures for property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Restructuring Charges Restructuring Charges [Member] Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Operating loss carryforwards Operating Loss Carryforwards Employee Stock Option Granted Thereafter Employee Stock Option Granted Thereafter [Member] Employee stock option granted thereafter. Common stock, shares issued (in shares) Common Stock, Shares, Issued Purchase discount fees TransfersOfFinancialAssetsAccountedForAsSalesDiscountFee TransfersOfFinancialAssetsAccountedForAsSalesDiscountFee Unisys Federal Unisys Federal [Member] Unisys Federal [Member] Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Entity Address, City or Town Entity Address, City or Town Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Changes in Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Capitalized software and software licenses Software and Software Development Costs [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Changes in Accumulated Other Comprehensive Loss by Component Comprehensive Income (Loss) Note [Text Block] Debt Covenant Period [Domain] Debt Covenant Period [Domain] [Domain] for Debt Covenant Period Interest expense Interest expense Interest Expense Accrued payroll and employee benefits Increase (Decrease) in Employee Related Liabilities Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Expected rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Loss Contingency Nature Loss Contingency Nature [Axis] Operating Lease, Right-of-Use Asset, Impairment Operating Lease, Right-of-Use Asset, Impairment [Member] Operating Lease, Right-of-Use Asset, Impairment Other accrued liabilities Other Accrued LIabilities [Member] Other Accrued LIabilities [Member] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Capitalized contract cost, amortization Capitalized Contract Cost, Amortization 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year One Retained earnings Retained Earnings (Accumulated Deficit) Contractual term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Interest rate swap 3 Interest Rate Swap, Number Three [Member] Interest Rate Swap, Number Three [Member] Backlog Order or Production Backlog [Member] Payroll tax deferral Deferred Tax Liabilities, Tax Deferred Income Forfeiture Support Associates J.V. Forfeiture Support Associates J.V. [Member] Forfeiture Support Associates J.V. [Member] Cash received from exercises of stock options Proceeds from Stock Options Exercised Cash Acquired in Excess of Payments to Acquire Business Cash Acquired in Excess of Payments to Acquire Business Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Total stockholders' equity Balance, beginning of period Balance, end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Amendment Flag Amendment Flag Vesting Stock Awards Granted Thereafter Vesting Stock Awards Granted Thereafter [Member] Vesting stock awards granted thereafter. Equity Components [Axis] Equity Components [Axis] Concentration Risk Type Concentration Risk Type [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Inventories, net Inventory, Net Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Federal Deferred Federal Income Tax Expense (Benefit) Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Entity Public Float Entity Public Float Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference [Text Block] Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Increase (decrease) in accrued plan share repurchases Increase Decrease In Accrued Plan Share Repurchases Increase (decrease) in accrued plan share repurchases. Short-term Lease, Cost Short-term Lease, Cost Debt Instrument, Redemption, Period Three Debt Instrument, Redemption, Period Three [Member] Amortization of Off Market Customer Contracts Amortization of Off Market Customer Contracts Amortization of Off Market Customer Contracts Statement [Line Items] Statement [Line Items] Unrecognized Tax Benefits, Increase Resulting from Available Tax Credits Unrecognized Tax Benefits, Increase Resulting from Available Tax Credits Unrecognized Tax Benefits, Increase Resulting from Available Tax Credits Term Loan A2 Facility due October 2023 Term Loan A2 Facility Due October 2023 [Member] Term Loan A2 Facility Due October 2023 Pre-contract costs Pre-Contract Cost [Member] Pre-Contract Cost [Member] Weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Federal Domestic Tax Authority [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Restructuring Plan 2020 Restructuring Plan 2020 [Member] Restructuring Plan 2020 Debt Disclosure [Abstract] Debt Disclosure [Abstract] Property, Plant and Equipment, Type Long-Lived Tangible Asset [Axis] Valuation allowance Deferred Tax Assets, Valuation Allowance Department of Defense Department Of Defense [Member] Department Of Defense [Member] Favorable adjustments Increase In Income From Change In Contract Estimates Increase in income from change in contract estimates. Until July 31, 2016 First Term [Member] First term. Customer [Axis] Customer [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Retirement Plans Retirement Benefits [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Document Annual Report Document Annual Report Vesting [Axis] Vesting [Axis] Income tax impact Other Comprehensive Income (Loss), Tax First Amendment to the Third Amended Credit Agreement First Amendment to the Third Amended Credit Agreement [Member] First Amendment to the Third Amended Credit Agreement [Member] Issuances of stock Proceeds from Issuance of Common Stock Total assets Assets Directors Director [Member] Plan Name Plan Name [Domain] Defined Benefit Plan, Equity Securities, US Defined Benefit Plan, Equity Securities, US [Member] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Internal research and development costs included in selling, general and administrative expenses Research and Development Expense Non-controlling Interest Noncontrolling Interest [Member] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Derivative Contract Derivative Contract [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Vesting Stock Award Activity Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Carryforward amount Tax Credit Carryforward, Amount Office furniture and fixtures Furniture and Fixtures [Member] February 2019 Credit Facility February 2019 Credit Facility [Member] February 2019 Credit Facility [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Business Combination, Additional Cash Payments Business Combination, Additional Cash Payments Business Combination, Additional Cash Payments Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Basic weighted-average number of shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Prime contractor to federal government Prime Contractor [Member] Prime Contractor [Member] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Comprehensive income attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Employee Severance Employee Severance [Member] Firm-fixed price (FFP) Fixed-price Contract [Member] Net favorable adjustments, after tax Increase Decrease In Income From Change In Contract Estimates Net Of Tax Increase (decrease) in income from change in contract estimates net of tax. Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Deferred income taxes Deferred Income Tax Liabilities, Net Other long-term liabilities Other Noncurrent Liabilities [Member] Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Purchases Guaranteed Deposit Account, Increase For Purchases Guaranteed Deposit Account, Increase For Purchases Reconciliation of Provision for Income Taxes Computed by Statutory Federal Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts payable Accounts Payable, Current Depreciation and amortization expense Depreciation, Depletion and Amortization AOCI Attributable to Parent [Member] AOCI Attributable to Parent AOCI Attributable to Parent [Member] Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Common stock, shares outstanding (in shares) Balance, (in shares) Balance, (in shares) Common Stock, Shares, Outstanding Other operating income Other Operating Income (Expense), Net Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed Operating Lease Right of Use Asset BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightofUseAsset BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightofUseAsset Proceeds from Divestiture of Businesses Proceeds from Divestiture of Businesses Entity Central Index Key Entity Central Index Key Lease, Cost Lease, Cost Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets Customer relationships Customer Relationships [Member] (Decrease) increase in accrued property, plant, and equipment Decrease In Capital Expenditures Incurred But Not Yet Paid Decrease in capital expenditures incurred but not yet paid. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory, Current Assets, Prepaid Expense and Other Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventoryPrepaidExpensesandOtherCurrentAssets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventoryPrepaidExpensesandOtherCurrentAssets Property, Plant, and Equipment Property, Plant and Equipment Disclosure [Text Block] Long-term rate of return Defined Benefit Plan, Plan Assets, Long-term Rate of Return Defined Benefit Plan, Plan Assets, Long-term Rate of Return Other long-term liabilities Other Liabilities, Noncurrent Benefit obligation Benefit obligation at beginning of year Benefit obligation at end of year Defined Benefit Plan, Benefit Obligation Restructuring Plan 2022 Restructuring Plan 2022 [Member] Restructuring Plan 2022 Long Term Debt Schedule of Long-term Debt Instruments [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Trading Symbol Trading Symbol Right of use assets Deferred Tax Liabilities, Operating Lease, Right-of-Use Asset Deferred Tax Liabilities, Operating Lease, Right-of-Use Asset Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Unrealized Gains (losses) on Fixed Interest Rate Swap Cash Flow Hedges Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Options vested and expected to vest, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Severance Costs Severance Costs Vesting after three years Share-based Payment Arrangement, Tranche Three [Member] Cash collected, not remitted to Purchaser(2) TransfersOfFinancialAssetsAccountedForAsSalesCashCollectedNotRemittedToPurchaser TransfersOfFinancialAssetsAccountedForAsSalesCashCollectedNotRemittedToPurchaser Long-term debt, net of current portion Total long-term debt, net of current portion Long-term Debt, Excluding Current Maturities Costs Allocated to Contracts Cost of Goods and Service [Policy Text Block] Options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Percentage of target shares Maximum Range Of Awards Of Target Number Of Shares The maximum percentage of target number of shares to be issued. Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Construction in process Construction in Progress [Member] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Derivative Instruments Designated as Cash Flow Hedges Schedule of Derivative Instruments [Table Text Block] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Current assets: Assets, Current [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Gross carrying value Finite-Lived Intangible Assets, Gross Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Impairment of Long-lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Fulfillment costs - non-current Fulfillment Cost, Non-Current [Member] Fulfillment Cost, Non-Current [Member] Fulfillment costs - current Fulfillment Cost, Current [Member] Fulfillment Cost, Current [Member] Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Accounting Standards Update 2018-02 Accounting Standards Update 2018-02 [Member] Restructuring Plan 2021 Restructuring Plan 2021 [Member] Restructuring Plan 2021 Reductions for prior year tax positions related to statute expiration Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Stock-Based Awards Excluded from Weighted Average Number of Shares Outstanding Used to Compute Diluted EPS Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Auditor Firm ID Auditor Firm ID Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Change in benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Buildings and improvements Building and Building Improvements [Member] Increase (decrease) resulting from changes in operating assets and liabilities, net of the effect of the acquisitions: Increase (Decrease) in Operating Capital [Abstract] Debt Instrument, Interest Rate During Period Debt Instrument, Interest Rate During Period Awards vested (in dollars per share) Performance shares vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Class of Stock [Domain] Class of Stock [Domain] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Stock exchanged at fair value upon exercises of stock options Stock Cancelled To Cover Price Of Options Exercises Stock cancelled to cover price of options exercises. Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Debt Instrument, Name Debt Instrument, Name [Domain] Schedule of Share-Based Compensation Activity Related to Exercise of Stock Options Schedule Of Share Based Compensation Activity Related To Exercise Of Stock Options Table [Table Text Block] Schedule of share based compensation activity related to exercise of stock options. Other current assets Other Assets, Current Other assets Increase (Decrease) in Other Noncurrent Assets Amount computed at the statutory federal income tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant accounting policies. Exited Facilities Exited Facilities [Member] Exited Facilities Write off of Deferred Debt Issuance Cost Write off of Deferred Debt Issuance Cost Defined benefit obligation adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Inventory Inventory, Policy [Policy Text Block] Pension Plan [Member] Pension Plan [Member] Fixed asset basis difference Deferred Tax Liabilities, Fixed Asset Basis Difference Deferred Tax Liabilities, Fixed Asset Basis Difference Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Aggregate intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share based compensation arrangement by share based payment award options aggregate intrinsic value. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]