Commitments and Contingencies Disclosure [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Leidos, Inc.
Subsidiaries [Member]
Statement [Line Items]
Statement [Line Items]
Legal Proceedings
Legal Matters and Contingencies [Text Block]
Disclosure Leases Additional Information [Abstract]
Disclosure Leases Additional Information [Abstract]
Capital lease obligations
Capital Lease Obligations
Remaining term of capital lease
Remaining Term of Capital Lease
Remaining Term of Capital Lease
Supplemental Cash Flow Information [Abstract]
Schedule of Supplementary Cash Flow Information
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Disclosure Schedule Of Certain Financial Statement Captions [Abstract]
Disclosure - Schedule of Certain Financial Statement Captions [Abstract]
Schedule of Certain Financial Statement Captions
Schedule Of Certain Financial Statement Captions [Text Block]
Schedule Of Certain Financial Statement Captions
Income Statement
Condensed Income Statement [Table Text Block]
Related Party Transactions [Abstract]
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Customer Relationships
Customer Relationships [Member]
Software and Technology
Computer Software, Intangible Asset [Member]
Other
Other Finite Lived Intangible Assets [Member]
Other Finite Lived Intangible Assets
Indefinite-lived Intangible Assets by Major Class [Axis]
Indefinite-lived Intangible Assets [Axis]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
Indefinite-lived Intangible Assets, Major Class Name [Domain]
In-Process Research And Development
In Process Research and Development [Member]
Trade Names
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Gross carrying value
Finite-Lived Intangible Assets, Gross
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Net carrying value
Finite-Lived Intangible Assets, Net
Indefinite-lived intangible assets
Indefinite-Lived Intangible Assets (Excluding Goodwill)
Total intangible assets, Gross carrying value
Intangible Assets, Gross (Excluding Goodwill)
Total intangible assets, Net carrying value
Intangible Assets, Net (Excluding Goodwill)
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Plainfield Renewal Energy Holdings LLC
Plainfield Renewal Energy Holdings LLC [Member]
Plainfield Renewal Energy Holdings LLC [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Schedule of Finite-lived, Indefinite-lived and Goodwill
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
Schedule of Details of Purchase Price
Schedule of Details of Purchase Price [Text Block]
Schedule of Details of Purchase Price [Text Block]
Estimated Fair Values of Assets Acquired And Liabilities Assumed
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivative
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Earnings Per Share [Abstract]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Stock Options
Employee Stock Option [Member]
Outstanding Stock Awards
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Income Tax Disclosure [Abstract]
Amount computed at the statutory federal income tax rate (35%)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
State income taxes, net of federal tax benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
Taxable conversion of subsidiary
Effective Income Tax Rate Reconciliation Taxable Conversion of Subsidiary from Corporation to Limited Liability Company
Effective Income Tax Rate Reconciliation Taxable Conversion of Subsidiary from Corporation to Limited Liability Company
Change in valuation allowance for deferred tax assets
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Change in accruals for uncertain tax positions
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Research and development credits
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount
Dividends paid to employee stock ownership plan
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Amount
U.S. manufacturing activity benefit
Income Tax Reconciliation Tax Credits Manufacturing Activity Benefit
Income Tax Reconciliation Tax Credits Manufacturing Activity Benefit
Non-deductible penalties
Income Tax Reconciliation Non Deductible Penalties
Income tax reconciliation non-deductible penalties
Non-deductible goodwill
Income Tax Reconciliation, Non Deductible Expense, Goodwill Impairment
Income Tax Reconciliation, Non Deductible Expense, Goodwill Impairment
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Total
Income Tax Expense (Benefit)
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Goodwill and Intangible Assets Disclosure [Table]
Goodwill And Intangible Assets Disclosure [Table]
Goodwill and Intangible Assets Disclosure [Table]
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Disposal Groups, Including Discontinued Operations, Name [Domain]
Disposal Group Name [Domain]
HES
Health and Engineering [Member]
Health and Engineering [Member]
Subsegments [Axis]
Subsegments [Axis]
Subsegments [Domain]
Subsegments [Domain]
Engineering
Engineering [Member]
Engineering [Member]
Health Solutions
Health Solutions [Member]
Health Solutions [Member]
Valuation Technique [Axis]
Valuation Technique [Axis]
Valuation Technique [Domain]
Valuation Technique [Domain]
Income Approach Valuation Technique
Income Approach Valuation Technique [Member]
Market Approach Valuation Technique
Market Approach Valuation Technique [Member]
Reveal Imaging Technologies, Inc.
Reveal Imaging Technologies, Inc. [Member]
Reveal Imaging Technologies, Inc. [Member]
Vitalize and maxIT
Vitalize and maxIT [Member]
Vitalize and maxIT [Member]
Business Segments [Axis]
Segments [Axis]
Segment [Domain]
Segments [Domain]
NSS
National Security Solutions [Member]
National Security Solutions [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill and Intangible Assets Disclosure [Line Items]
Fair Value Inputs, EBITDA multiple
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple
Fair Value Inputs, revenue multiple
Fair Value Inputs, Revenue Multiple
Fair Value Inputs, control premium
Fair Value Inputs, Control Premium
Fair Value Inputs, LT revenue growth rate
Fair Value Inputs, Long-term Revenue Growth Rate
Fair Value Inputs, Cap rate
Fair Value Inputs, Cap Rate
Fair Value Input, Specific company risk premium
Fair Value Input, Specific Company Risk Premium
Fair Value Input, Specific Company Risk Premium
Fair Value as percentage of carrying value
Goodwill Impairment, Fair Value as Percentage of Carrying Value
Goodwill Impairment, Fair Value as Percentage of Carrying Value
Goodwill impairment charges
Goodwill, Impairment Loss
Amortization expense related to amortizable intangible assets
Amortization of Intangible Assets
Useful life of intangible assets
Finite-Lived Intangible Asset, Useful Life
Intangible asset impairment
Impairment of Intangible Assets, Finite-lived
Asset impairment charges
Asset Impairment Charges
Composition of Certain Financial Statement Captions
Composition Of Certain Financial Statement Captions [Text Block]
Composition Of Certain Financial Statement Captions
Other Commitments And Contingencies [Table]
Other Commitments And Contingencies [Table]
Other Commitments And Contingencies [Table]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event
Subsequent Event [Member]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Pre-Separation
Predecessor [Member]
Virnet X Inc
Virnet X Inc [Member]
Virnet X Inc [Member]
Leidos
Leidos [Member]
Leidos [Member]
SAIC
SAIC [Member]
SAIC [Member]
Equity Method Investee, Name [Axis]
Investment, Name [Axis]
Equity Method Investee, Name [Domain]
Investment, Name [Domain]
Bechtel SAIC Company, LLC
Bechtel Saic Company Llc [Member]
Bechtel Saic Company Llc [Member]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Standby Letters of Credit
Standby Letters of Credit [Member]
Performance Guarantee
Performance Guarantee [Member]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Government Investigations And Reviews
Government Investigations And Reviews [Member]
Government Investigations and Reviews [Member]
Other Commitments And Contingencies [Line Items]
Other Commitments And Contingencies [Line Items]
Other Commitments And Contingencies [Line Items]
Number of patents infringed
Number Of Patents Infringed
Number of Patents Infringed
Litigation settlement
Litigation Settlement, Amount
Patents found infringed upon, number
Gain Contingency, Patents Found Infringed upon, Number
Percentage of settlement
Litigation Settlement, Amount, Percentage of Total
Litigation Settlement, Amount, Percentage of Total
Percentage receivable by the company
Litigation Settlement, Percentage Receivable by the Company
Litigation Settlement, Percentage Receivable by the Company
Proceeds from Legal Settlements
Proceeds from Legal Settlements
Liability for estimate of loss
Loss Contingency Accrual, Provision
Loss contingency accrual
Loss Contingency Accrual
Ownership interest (in percentage)
Equity Method Investment, Ownership Percentage
Amount outstanding
Letters of Credit Outstanding, Amount
Surety bonds
Surety Bonds Amount Outstanding
Surety Bonds, Amount Outstanding
Estimated accruals for claims incurred but not yet reported
Liability for Claims and Claims Adjustment Expense
Derivative [Table]
Derivative [Table]
Derivative [Line Items]
Derivative [Line Items]
Derivative Instruments and Hedging Activities
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment
Property, Plant and Equipment [Table Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Senior Notes [Member]
Senior Notes [Member]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Other Income, Net
Other Income, Net [Member]
Other Income, Net [Member]
Extinguishment of Debt [Axis]
Extinguishment of Debt [Axis]
Extinguishment of Debt, Type [Domain]
Extinguishment of Debt, Type [Domain]
Notes Payable
Notes Payable, Other Payables [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Notes Which Mature In December 2020
Notes Which Mature On December Two Thousand Twenty [Member]
Notes Which Mature on December Two Thousand Twenty [Member]
Notes Which Mature In December 2040
Notes Which Mature On December Two Thousand Forty [Member]
Notes Which Mature On December Two Thousand Forty [Member]
Notes Which Mature In July 2033
Notes Which Mature On July Two Thousand Thirty Three [Member]
Notes Which Mature On July Two Thousand Thirty Three [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Senior unsecured notes
Senior Notes
Fair value adjustment
Liabilities, Fair Value Adjustment
Note payable, face amount
Debt Instrument, Face Amount
Stated interest rate
Debt Instrument, Interest Rate, Stated Percentage
Amortization of financing costs
Amortization of Deferred Debt Issuance Cost And Debt Discount
Amortization of Deferred Debt Issuance Cost And Debt Discount
Extinguishment of Debt, Amount
Extinguishment of Debt, Amount
Debt repurchased amount
Debt Instrument, Repurchase Amount
Gain (loss) on extinguishment of debt
Gain (Loss) on Repurchase of Debt Instrument
Repayments of debt
Repayments of Long-term Debt
Accounting Policies [Abstract]
Strategic advisory services
Strategic Advisory Services Expense
Strategic Advisory Services Expense
Legal and accounting services
Legal And Accounting Services Expense
Legal And Accounting Services Expense
Lease termination and facility consolidation expenses
Lease Termination and Facility Consolidation Expense
Lease Termination and Facility Consolidation Expense
Severance costs
Severance Costs
Separation transaction expenses in operating income
Restructuring Charges, Including Separation Costs
Restructuring Charges, Including Separation Costs
Less: income tax benefit
Restructuring Related Income Tax Benefit
Restructuring Related Income Tax Benefit
Separation transaction expenses, net of tax
Restructuring Charges, Including Separation Charges, Net of Tax
Restructuring Charges, Including Separation Charges, Net of Tax
Compensation and Retirement Disclosure [Abstract]
Retirement Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment
Property, Plant and Equipment Disclosure [Text Block]
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
One Customer
One Customer [Member]
One Customer [Member]
Two Customers
Two Customers [Member]
Two Customers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed Contracts Receivable
Billed Contracts Receivable
Unbilled Contracts Receivable
Unbilled Contracts Receivable
Accounts receivable, gross
Contract Receivable Retainage
Allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Current
Accounts receivable, net
Accounts Receivable, Net, Current
Accounts receivable, net, noncurrent
Accounts Receivable, Net, Noncurrent
Allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Noncurrent
Number of projects
Number of Projects
Number of Projects
Bad debt expense
Provision for Doubtful Accounts
Proceeds from sale of receivables
Proceeds from Sale and Collection of Receivables
Nature of Operations and Basis of Presentation
Nature Of Operations Policy [Text Block]
Nature of Operations
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Operating Cycle
Operating Cycle Policy [Text Block]
Operating Cycle
Variable Interest Entities
Consolidation, Variable Interest Entity, Policy [Policy Text Block]
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Changes In Estimates On Contracts
Changes In Estimates On Contracts [Policy Text Block]
Changes In Estimates On Contracts [Policy Text Block]
Dispositions
Discontinued Operations, Policy [Policy Text Block]
Pre-contract Costs
Precontract Costs, Policy [Policy Text Block]
Fair Value Measurement
Fair Value of Financial Instruments, Policy [Policy Text Block]
Financial Instruments
Financial Instruments Policy [Text Block]
Financial Instruments
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Restricted Cash
Restricted Cash Policy [Text Block]
Restricted Cash
Concentration of Credit Risk
Concentration Of Credit Risk Policy [Text Block]
Concentration Of Credit Risk
Investments
Investment, Policy [Policy Text Block]
Inventories
Inventory, Policy [Policy Text Block]
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Goodwill and Intangible Assets
Goodwill and Intangible Assets, Policy [Policy Text Block]
Selling, General and Administrative Expenses
Selling, General and Administrative Expenses, Policy [Policy Text Block]
Income Taxes
Income Tax, Policy [Policy Text Block]
Stock-Based Compensation
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Foreign Currency
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Accounting Standards Updates Adopted
Accounting Standards Updates Adopted Policy [Text Block]
Accounting Standards Updates Adopted
Description of New Accounting Pronouncements Not Yet Adopted
Accounting Standards Updates Issued But Not Yet Adopted Policy [Text Block]
Accounting Standards Updates Issued But Not Yet Adopted
Receivables
Receivables, Policy [Policy Text Block]
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
HES
Emergency Management Consulting [Member]
Emergency Management Consulting [Member]
Cloudshield Technologies
Cloudshield Technologies [Member]
Cloudshield Technologies [Member]
Other Disposals
Other Disposals [Member]
Other Disposals [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses
Proceeds from Divestiture of Businesses
Impairment of assets
Impairment of Long-Lived Assets to be Disposed of
Unsecured borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Borrowings outstanding under the revolving credit facility
Long-term Line of Credit
Reimbursement to Leidos, Inc.
Proceeds from (Repayments of) Debt
Capital contribution to new SAIC
Adjustments to Additional Paid in Capital, Contribution Paid for Divesture
Adjustments to Additional Paid in Capital, Contribution Paid for Divesture
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Government Contracts Concentration Risk
Government Contracts Concentration Risk [Member]
Major Customers [Axis]
US DoD
US DoD [Member]
US DoD [Member]
U.S. Government
U S Government [Member]
U S Government [Member]
U.S. Army
U S Army [Member]
U S Army [Member]
Maryland Procurement Office
Maryland Procurement Office [Member]
Maryland Procurement Office [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Percentage of sales
Concentration Risk, Percentage
Income Taxes [Table]
Income Taxes [Table]
Income Taxes [Table]
Tax Period [Axis]
Tax Period [Axis]
Tax Period [Domain]
Tax Period [Domain]
Expiration in Calender Year 2018 [Member]
Expiration Begin in Calender Year 2018 [Member]
Expiration Begins in Calender Year 2018 [Member]
Expiration in Calender Year 2016 [Member]
Expiration in Calender Year 2016 [Member]
Expiration in Calender Year 2016 [Member]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
State
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Axis]
Tax Credit Carryforward [Axis]
Tax Credit Carryforward, Name [Domain]
Tax Credit Carryforward, Name [Domain]
Capital Loss Carryforward [Member]
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Income Taxes [Line Items]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Decrease in unrecognized tax benefits due to resolutions with tax authorities
Tax Adjustments, Settlements, and Unusual Provisions
Tax benefit from dividend paid to New SAIC's employees
Tax Adjustments, Settlements, and Unusual Provisions, Dividend Paid to Employee of the New Company
Tax Adjustments, Settlements, and Unusual Provisions, Dividend Paid to Employee of the New Company
Tax benefit from special dividend paid by the company
Tax Adjustments, Settlements, and Unusual Provisions, Special Dividend
Tax Adjustments, Settlements, and Unusual Provisions, Special Dividend
Tax benefit due to conversion of subsidiary to LLC from Partnership
Income Tax Expense Benefit Due to Conversion of Subsidiary to LLC from Corporation
Income Tax Expense Benefit Due to Conversion of Subsidiary to LLC from Corporation
Reversal of accruals for unrecognized tax benefits
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions And Settlements With Tax Authorities
Unrecognized tax benefits increases resulting from prior period tax positions and settlements with tax authorities.
Net operating loss carryforwards
Operating Loss Carryforwards
State tax credit carryforwards
Tax Credit Carryforward, Amount
State tax credits
Deferred Tax Assets, Tax Credit Carryforwards
Unrecognized tax benefits accrued interest and penalties
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Liabilities for uncertain tax positions
Liability For Uncertain Tax Positions
Liability For Uncertain Tax Positions
Liabilities for uncertain tax positions, long-term
Liability for Uncertain Tax Positions, Noncurrent
Amount of reasonably possible resolution of reviews
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
Significant Accounting Policies [Table]
New Accounting Pronouncement, Early Adoption [Axis]
New Accounting Pronouncement, Early Adoption [Axis]
New Accounting Principles, Early Adoption [Domain]
New Accounting Principles, Early Adoption [Domain]
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement, Early Adoption, Effect [Member]
Disposal Group Classification [Axis]
Disposal Group Classification [Axis]
Disposal Group Classification [Domain]
Disposal Group Classification [Domain]
Spinoff
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Significant Accounting Policies [Line Items]
Significant Accounting Policies [Line Items]
Significant Accounting Policies [Line Items]
Reverse stock split
Stockholders' Equity Note, Stock Split, Conversion Ratio
Restructuring charges
Restructuring Charges
Ownership in VIE
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Percentage of shares of newly formed company after spin-off transaction
Percentage Of Ownership After Spinoff Transaction
Percentage of Ownership After Spinoff Transaction
Increase (decrease) in income due to contract estimates
Increase (Decrease) In Income From Change In Contract Estimates
Increase (Decrease) In Income From Change In Contract Estimates
Increase (decrease) in income due to contract estimates per diluted 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
Noncontrolling ownership interest, less than
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Internal research and development costs included in selling, general and administrative expenses
Research and Development Expense
Special cash dividend
Common Stock, Dividends, Per Share, Cash Paid
Payment towards dividends
Special Dividend Paid
Special Dividend Paid
Net current deferred tax assets
Deferred Tax Assets, Net, Current
Deferred tax liabilities
Deferred Tax Liabilities, Net, Noncurrent
Deferred tax assets
Deferred Tax Assets, Net, Noncurrent
Business Exit Costs
Business Exit Costs
Schedule of Notes Payable and Long-Term Debt
Schedule of Long-term Debt Instruments [Table Text Block]
Schedule of Maturities of Notes Payable and Long-Term Debt
Schedule of Maturities of Long-term Debt [Table Text Block]
Receivables
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Receivable from PRE Holdings
Receivable from PRE Holdings [Member]
Receivable from PRE Holdings [Member]
Forgiveness of accounts receivable (net of $32 million bad debt expense)
Noncash or Part Noncash Acquisition Accounts Receivable Forgiven
Noncash or Part Noncash Acquisition Accounts Receivable Forgiven
Contingent consideration
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High
Total purchase consideration
Business Combination, Consideration Transferred
Statement of Comprehensive Income [Abstract]
Net income (loss)
Net Income (Loss) Attributable to Parent
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Deferred taxes
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
Foreign currency translation adjustments, net of tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Reclassification of realized loss on settled derivative instruments to net income
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax
Deferred taxes
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax
Reclassification of realized loss on settled derivative instruments to net income, net of tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Pension liability adjustments
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax
Deferred taxes
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax
Pension liability adjustments, net of tax
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax
Total other comprehensive income (loss), net of tax
Other Comprehensive Income (Loss), Net of Tax
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Inventory, prepaid expenses and other current assets:
Inventory Prepaid Expenses And Other Current Assets [Abstract]
Inventory, prepaid expenses and other current assets
Prepaid income taxes and tax refunds receivable
Prepaid Taxes
Inventories
Inventory, Net
Restricted cash
Restricted Cash and Cash Equivalents, Current
Prepaid expenses
Prepaid Expense, Current
Deferred income taxes
Deferred Income Taxes and Other Assets, Current
Other
Other Assets, Miscellaneous, Current
Total inventory, prepaid expenses and other current assets
Other Assets, Current
Accounts payable and accrued liabilities:
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued liabilities
Accrued Liabilities, Current
Accounts payable
Accounts Payable, Current
Collections in excess of revenues on uncompleted contracts and deferred revenue
Collections In Excess Of Revenues And Deferred Revenue
Collections In Excess Of Revenues And Deferred Revenue.
Total accounts payable and accrued liabilities
Accounts Payable and Accrued Liabilities, Current
Accrued payroll and employee benefits:
Employee-related Liabilities, Current [Abstract]
Salaries, bonuses and amounts withheld from employees’ compensation
Salaries Bonuses And Amounts Withheld From Employees Compensation
Salaries, bonuses and amounts withheld from employees' compensation.
Accrued vacation
Accrued Vacation, Current
Accrued contributions to employee benefit plans
Accrued Employee Benefits, Current
Total Accrued payroll and employee benefits
Employee-related Liabilities, Current
Other long-term liabilities:
Other Noncurrent Liabilities [Abstract]
Other Noncurrent Liabilities [Abstract]
Deferred compensation
Deferred Compensation Liability, Classified, Noncurrent
Lease related obligations
Operating Lease Obligation, Noncurrent
Operating Lease Obligation, Noncurrent
Accrued pension liabilities
Defined Benefit Pension Plan, Liabilities, Noncurrent
Liabilities for uncertain tax positions
Other
Other Liabilities Noncurrent Other
Other Liabilities Noncurrent Other.
Total other long-term liabilities
Other Liabilities, Noncurrent
Other income (expense), net
Nonoperating Income (Expense) [Abstract]
Gain on sale of former headquarters
Gain (Loss) on Disposition of Property Plant Equipment
Other income (expense), net
Other Income (Expense), Net
Other Income (Expense), Net
Other income (expense), net
Other Nonoperating Income (Expense)
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Current, Federal and foreign
Current Federal and Foreign Tax Expense (Benefit)
Current Federal and Foreign Tax Expense (Benefit)
Current, State
Current State and Local Tax Expense (Benefit)
Deferred, Federal and foreign
Deferred Federal and Foreign Income Tax Expense (Benefit)
Deferred Federal and Foreign Income Tax Expense (Benefit)
Deferred, State
Deferred State and Local Income Tax Expense (Benefit)
Reconciliation of Weighted Average Number of Shares Outstanding
Schedule of Weighted Average Number of Shares [Table Text Block]
Schedule Of Basic and Diluted EPS
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule Of Stock-Based Awards Excluded from Weighted Average Shares Outstanding
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Equity Award [Domain]
Performance Shares [Member]
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value (per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Expected term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Expected volatility, percentage
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Risk-free interest rate, percentage
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Dividend yield, percentage
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Quarterly Financial Information Disclosure [Abstract]
Schedule of Selected Quarterly Financial Data
Schedule of Quarterly Financial Information [Table Text Block]
Leases [Abstract]
Schedule of Rental Expense for Facilities and Equipment
Schedule of Rent Expense [Table Text Block]
Schedule of Future Minimum Lease Commitments and Sublease Receipts under Non-Cancelable Operating Leases
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Debt
Long-term Debt [Text Block]
2016
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
2017
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2018
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2019
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2020
Finite-Lived Intangible Assets, Amortization Expense, Year Five
2021 and thereafter
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Schedule of Changes in Goodwill by Segment
Schedule of Goodwill [Table Text Block]
Schedule of Intangible Assets Including Estimates of Assets Acquired
Schedule of Intangible Assets and Goodwill [Table Text Block]
Schedule of Amortization Expense for Finite-Lived Intangible Assets
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
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]
Additions for tax positions related to current year
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Additions for tax positions related to prior years
Reductions for tax positions related to prior years
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions
Settlements with taxing authorities
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities
Lapse of statute of limitations
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations
Unrecognized tax benefits at end of year
Unrecognized Tax Benefits
Unrecognized tax benefits at beginning of year
Unrecognized tax benefits that, if recognized, would affect the effective income tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Leases
Operating Leases of Lessee Disclosure [Table Text Block]
Schedule of Segment Reporting Information by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Total Revenue Percentages Contributable to Specific Government Agencies
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Expected number of shares of stock to be issued under performance-based stock awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Awards canceled/forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Awards granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Awards vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Shares, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, Shares, beginning 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
Weighted average grant-date fair value, Awards 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
Weighted average grant-date fair value, Awards forfeited/canceled (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
Weighted average grant-date fair value, Awards 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
Weighted average grant-date fair value, Shares, ending balance (in dollars per share)
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
Performance period (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Percentage of revenues contributed by external customers to total revenues
Basis For Attributing Revenues From External Customers
Basis For Attributing Revenues From External Customers
Operating Activities [Axis]
Operating Activities [Axis]
Operating Activities [Domain]
Operating Activities [Domain]
Continuing Operations
Continuing Operations [Member]
Discontinued Operations
Discontinued Operations [Member]
Vesting Stock Awards
Vesting Stock Awards [Member]
Vesting Stock Awards [Member]
Vested Stock Awards
Vested Stock Awards [Member]
Vested Stock Awards [Member]
Total stock-based compensation expense recorded in continuing operations
Allocated Share-based Compensation Expense
Tax benefits recognized from stock-based compensation
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Equipment
Equipment [Member]
Building
Building [Member]
Building improvements and leasehold improvements
Building Improvements And Leasehold Improvements [Member]
Building Improvements And Leasehold Improvements [Member].
Office furniture and fixtures
Furniture and Fixtures [Member]
Estimated useful lives (in years)
Property, Plant and Equipment, Estimated Useful Lives
Estimated useful lives (in years)
Property, Plant and Equipment, Useful Life
Income Statement [Abstract]
Revenues
Revenues
Costs and expenses:
Costs and Expenses [Abstract]
Cost of revenues
Cost of Revenue
Selling, general and administrative expenses
Selling, General and Administrative Expense
Separation transaction and restructuring expenses
Operating income (loss)
Operating Income (Loss)
Non-operating income (expense):
Interest income
Interest Income, Other
Interest expense
Interest Expense
Other income (expense), net
Income (loss) from continuing operations before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Income tax expense
Income (loss) from continuing operations
Income (Loss) from Continuing Operations Attributable to Parent
Discontinued operations (Note 2):
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
(Loss) income from discontinued operations before income taxes
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax
Income tax benefit (expense)
Discontinued Operation, Tax Effect of Discontinued Operation
(Loss) income from discontinued operations
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Net income (loss)
Earnings (loss) per share (Note 12):
Basic:
Earnings Per Share, Basic [Abstract]
Income (loss) from continuing operations (usd per share)
Income (Loss) from Continuing Operations, Per Basic Share
Income (loss) from discontinued operations (usd per share)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share
Basic earnings (loss) per share (usd per share)
Earnings Per Share, Basic
Diluted:
Earnings Per Share, Diluted [Abstract]
Income (loss) from continuing operations (usd per share)
Income (Loss) from Continuing Operations, Per Diluted Share
Income (loss) from discontinued operations (usd per share)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share
Diluted earnings (loss) per share (usd per share)
Earnings Per Share, Diluted
Schedule of Provision for Income Taxes
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Reconciliation of Provision for Income Taxes
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Deferred Tax Assets (Liabilities)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Net Deferred Tax Assets
Schedule Of Classified Deferred Tax Assets And Liabilities Table [Text Block]
Schedule Of Classified Deferred Tax Assets And Liabilities
Schedule of Changes in Unrecognized Tax Benefits
Summary of Income Tax Contingencies [Table Text Block]
Other Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Restructuring Type [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Severance Costs
Employee Severance [Member]
Lease Termination and Facility Consolidation Expenses
Facility Closing [Member]
Restructuring Reserve Disclosures [Abstract]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Opening balance
Restructuring Reserve
Charges
Cash payments
Payments for Restructuring
Closing balance
Subsequent Events [Abstract]
Subsequent Event [Table]
Subsequent Event [Table]
Counterparty Name [Axis]
Counterparty Name [Axis]
Counterparty Name [Domain]
Counterparty Name [Domain]
Lockheed Martin Shareholders'
Lockheed Martin Shareholders' [Member]
Lockheed Martin Shareholders' [Member]
Spinco
Abacus Innovations Corporation (Spinco) [Member]
Abacus Innovations Corporation (Spinco) [Member]
Lockheed Martin Merger
Lockheed Martin Merger [Member]
Lockheed Martin Merger [Member]
Scenario, Forecast
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Number of shares Lockheed Martin shareholders will receive from Leidos
Business Combination, Merger Agreement, Equity Interest Issued or Issuable , Number of Shares
Business Combination, Merger Agreement, Equity Interest Issued or Issuable , Number of Shares
Number of shares Lockheed Martin shareholders will receive from Leidos, as a percentage of Leidos common stock (in percentage)
Business Combination, Merger Agreement, Equity Interest Issued or Issuable , Percentage of Common Stock Issued To The Acquiree Company
Business Combination, Merger Agreement, Equity Interest Issued or Issuable , Percentage of Common Stock Issued To The Acquiree Company
Percentage of common stock retained by the Leidos ( in percentage)
Business Combination, Merger Agreement, Percentage of Common Stock Retained by the Acquiring Company
Business Combination, Merger Agreement, Percentage of Common Stock Retained by the Acquiring Company
Debt financing
Proceeds from Issuance of Long-term Debt
Payments to Parent, Special Payment
Payments to Parent, Special Payment
Payments to Parent, Special Payment
Accrued dividends declared
Dividends Payable
Termination fees
Business Combination, Merger Agreement, Termination Fees
Business Combination, Merger Agreement, Termination Fees
Reimbursement of expense, if termination of merger is due to rejection from shareholders'
Business Combination, Merger Agreement, Termination Fees, Termination Due To Rejection From Shareholders'
Business Combination, Merger Agreement, Termination Fees, Termination Due To Rejection From Shareholders'
Statement of Cash Flows [Abstract]
Cash acquired in acquisitions
Cash Divested from Deconsolidation
Statement of Stockholders' Equity [Abstract]
Disposals of FY 2013
Disposals of Twenty Thirteen [Member]
Disposals of Twenty Thirteen [Member]
Cash dividend per share
Common Stock, Dividends, Per Share, Declared
Stock based compensation from discontinued operations
Statement of Financial Position [Abstract]
Preferred stock, par value
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized
Preferred Stock, Shares Authorized
Preferred stock, shares issued
Preferred Stock, Shares Issued
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding
Common stock, par value
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares issued
Common Stock, Shares, Issued
Common stock, shares outstanding
Common Stock, Shares, Outstanding
Schedule of Accounts Receivable
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Net current deferred tax assets
Deferred income taxes
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent
Net non-current deferred tax liabilities
Net deferred tax liabilities
Deferred Tax Liabilities, Net
Net deferred tax assets
Deferred Tax Assets, Net
Legal Proceedings [Table]
Legal Proceedings [Table]
Legal Proceedings [Table]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Litigation Case [Domain]
Data Privacy Litigation
Data Privacy Litigation [Member]
Data Privacy Litigation [Member]
Contracts by Third Party [Axis]
Contracts By Third Party [Axis]
Contracts by Third Party [Axis]
Contracts by Third Party [Domain]
Contracts By Third Party [Domain]
Contracts by Third Party [Domain]
Greek Government Contract
Greek Government Contract [Member]
Greek Government Contract [Member]
Legal Proceedings And Related Matters [Axis]
Legal Proceedings And Related Matters [Axis]
Legal Proceedings And Related Matters [Axis]
Legal Proceedings And Related Matters [Domain]
Legal Proceedings And Related Matters [Domain]
Legal Proceedings And Related Matters [Domain]
Securities Class Actions
Securities Class Actions [Member]
Securities Class Actions [Member]
Letters of Credit Related System Support and Maintenance
Letters Of Credit Related System Support And Maintenance [Member]
Letters of Credit Related System Support and Maintenance [Member]
Letters of Credit Relating to Delivery
Letters Of Credit Relating To Delivery [Member]
Letters of Credit Relating to Delivery [Member]
Timekeeping Contract with City of New York
Time Keeping Contract With City Of New York [Member]
Time keeping Contract With City of New York [Member]
Invoice For Undisputed Portion Of Contract
Invoice For Undisputed Portion Of Contract [Member]
Invoice for Undisputed Portion of Contract [Member]
Value Added Taxes
Value Added Taxes [Member]
Value Added Taxes [Member]
Legal Proceedings [Line Items]
Legal Proceedings [Line Items]
Legal Proceedings [Line Items]
Cash settlement payment
Payments for Legal Settlements
Administrative agreement, term (in years)
Administrative Agreement, Term
Administrative Agreement, Term
DPA provides that the monitor will serve for a period (in years)
Deferred Prosecution Agreement Provides Monitor Service Period
Deferred Prosecution Agreement Provides Monitor Service Period
Number of plaintiffs
Loss Contingency, Number of Plaintiffs
Number of lawsuits
Number Of Lawsuits
Number Of Lawsuits
Number of lawsuits, withdrawn
Loss Contingency Claims Resolved
Loss Contingency Claims Resolved
Number of lawsuits, consolidated
Consolidated Cases Number Of Lawsuits
Consolidated Cases Number Of Lawsuits
Number of former CEO's
Number of Former Chief Executive Officers
Number of Former Chief Executive Officers
Contracts receivable
Contract Receivable
Income Taxes Receivable
Income Taxes Receivable
Arbitral award
Gain Contingency, Unrecorded Amount
Tax refund receivable
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority
Recorded losses
Cumulative Contract Losses
Cumulative losses on a customer contract.
Receivables relating to value added taxes
Value Added Tax Receivable
Amount outstanding
Letter of credit available to the company
Third Party Credit Enhancement Amount
Third Party Credit Enhancement, Amount
Foreign currency translation adjustments, tax effect
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax
The tax effect from accumulated adjustment, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains (losses).
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax Effect
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax Effect
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax Effect
Unrecognized loss (gain) on defined benefit plan, tax effect
Accumulated Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Effect
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Effect
Total accumulated other comprehensive loss, tax effect
Accumulated Other Comprehensive Income Loss Tax
Accumulated Other Comprehensive Income (Loss), Tax
Income Taxes
Income Tax Disclosure [Text Block]
Stock-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Goodwill and Intangible Assets
Goodwill and Intangible Assets Disclosure [Text Block]
Electric generation facility
Electric Generation, Transmission and Distribution Equipment [Member]
Computers and other equipment
Computer and Other Equipment [Member]
Computer and Other Equipment [Member]
Leasehold improvements
Leasehold Improvements [Member]
Buildings and improvements
Building and Building Improvements [Member]
Land
Land [Member]
Construction in progress
Construction in Progress [Member]
Property, plant and equipment, gross
Property, Plant and Equipment, Gross
Less accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property, plant and equipment, net
Property, Plant and Equipment, Net
Depreciation
Depreciation
Property, Plant and Equipment, Disposals
Property, Plant and Equipment, Disposals
Business Segment Information
Segment Reporting Disclosure [Text Block]
Sale Leaseback Transaction [Table]
Sale Leaseback Transaction [Table]
Purchaser of the Property
Purchaser of the Property [Member]
Purchaser of the Property [Member]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument, Redemption, Period [Domain]
Prepaid Before December 17, 2018 [Member]
Prepaid Before December Seventeen Twenty Eighteen [Member]
Prepaid Before December Seventeen Twenty Eighteen [Member]
Prepaid Prior to Maturity [Member]
Prepaid Prior to Maturity [Member]
Prepaid Prior to Maturity [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Floor
Interest Rate Floor [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
30 day LIBOR
Thirty day LIBOR [Member]
Thirty day LIBOR [Member]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Long-term Liabilities
Other Noncurrent Liabilities [Member]
Notes payable and long-term debt, net of current portion
Capital Lease Obligations [Member]
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Description [Axis]
Sale Leaseback Transaction, Name [Domain]
Sale Leaseback Transaction, Name [Domain]
May 2013 Sales Lease Back Agreement
May 2013 Sales Lease Back Agreement [Member]
May 2013 Sales Lease Back Agreement [Member]
Fairfax County, Virginia, Two Office Buildings
Fairfax County, Virginia, Two Office Buildings [Member]
Fairfax County, Virginia, Two Office Buildings [Member]
Notes Payable, Other Payables
Fairfax County, Virginia, One Office Building [Member]
Fairfax County, Virginia, One Office Building [Member]
Multi-level Parking Garage
Multi-level Parking Garage [Member]
Multi-level Parking Garage [Member]
Surface Parking Lots
Surface Parking Lots [Member]
Surface Parking Lots [Member]
Amendment to the Original Purchase and Sale Agreement [Member]
Amendment to the Original Purchase and Sale Agreement [Member]
Amendment to the Original Purchase and Sale Agreement [Member]
Sale Leaseback Transaction [Line Items]
Sale Leaseback Transaction [Line Items]
Area of land
Area of Land
Number of real estate properties
Number of Real Estate Properties
Number of buildings leased back
Sale Leaseback Transaction, Number of Buildings Leased Back
Sale Leaseback Transaction, Number of Buildings Leased Back
Number of buildings sold
Sales and Leaseback Transaction, Number of Buildings Sold
Sales and Leaseback Transaction, Number of Buildings Sold
Proceeds from sale
Sale Leaseback Transaction, Net Proceeds, Financing Activities
Book value of the building sold
Sale Leaseback Transaction, Net Book Value
Net loss on sales and disposals of assets
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Term of lease
Sale Leaseback Transaction, Lease Terms
Term of debt instrument
Debt Instrument, Term
Rate of interest
Sale Leaseback Transaction, Imputed Interest Rate
Allocated consideration to Note parable and Other long-term liabilities
Sale Leaseback Transaction, Amount Due under Financing Arrangement
Write off of financing note payable
Gains (Losses) on Extinguishment of Debt
Write off of other long term liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Discount on proceeds
Sale Leaseback Transaction, Transaction Costs, Financing Activities
Proceeds from real estate financing transaction
Sale Leaseback Transaction, Gross Proceeds, Financing Activities
Gain (loss) on sale of properties
Gain (Loss) on Sale of Properties
Write off of property disposed
Lease termination fees
Gain (Loss) on Contract Termination
Selling costs
Selling Expense
Variable interest rate
Debt Instrument, Basis Spread on Variable Rate
Debt Instrument, Redemption, Percentage of Accrued Interest
Debt Instrument, Redemption, Percentage of Accrued Interest
Debt Instrument, Redemption, Percentage of Accrued Interest
Identifiable intangible assets (finite-lived)
Finite-lived Intangible Assets Acquired
Weighted average lives of finite-lived intangibles (years)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Separation Transaction Expenses
Restructuring and Related Costs [Table Text Block]
Schedule of Restructuring Reserve
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
Schedule of Depreciation using Estimated Useful Lives
Schedule of Finite-Lived Intangible Assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Accumulated Other Comprehensive Loss
Stockholders' Equity Note Disclosure [Text Block]
Supplementary Cash Flow Information
Cash Flow, Supplemental Disclosures [Text Block]
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Leidos Holding Inc.
Parent Company [Member]
Notes Which Mature In July 2032
Notes Which Mature On July Two Thousand Thirty Two [Member]
Notes Which Mature On July Two Thousand Thirty Two [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Notes payable, related parties
Notes Payable, Related Parties
Period extension for portions of intercompany loans (years)
Period Extension For Portions Of Intercompany Loans
Period extension for portions of intercompany loans.
Note receivable from Leidos Holdings, Inc.
Notes Receivable, Related Parties
Distribution upon separation
Distribution upon Separation
Distribution upon Separation
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Shares of Common stock
Common Stock [Member]
Additional paid-in capital
Additional Paid-in Capital [Member]
Accumulated earnings (deficit)
Retained Earnings [Member]
Accumulated other comprehensive loss
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, shares
Shares, Issued
Balance, value
Stockholders' Equity Attributable to Parent
Other comprehensive income (loss), net of tax
Issuances of stock (less forfeitures), shares
Stock Issued During Period, New Issues Net of Cancellations, Shares
Stock Issued During Period, New Issues Net of Cancellations, Shares
Issuances of stock (less forfeitures)
Stock Issued During Period, Value, New Issues Net of Cancellations
Stock Issued During Period, Value, New Issues Net of Cancellations
Repurchases of stock, shares
Stock Repurchased and Retired During Period, Shares
Repurchases of stock, value
Stock Repurchased and Retired During Period, Value
Dividends
Dividends, Common Stock
Special cash dividend of $4.00 per share
Dividends, Cash
Adjustments for income tax benefits from stock-based compensation
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net
Stock-based compensation
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Dividend received, net of contribution paid, from the spin-off of New SAIC
Adjustments to Additional Paid in Capital, Contribution Received from Divestitures
Adjustments to Additional Paid in Capital, Contribution Received from Divestitures
Spin-off of New SAIC
Stockholders' Equity Note, Spinoff Transaction
Other
Adjustments to Additional Paid in Capital, Other
Balance, shares
Balance, value
Discontinued Operations, Held-for-sale
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Contingent Consideration by Type [Axis]
Contingent Consideration by Type [Axis]
Contingent Consideration Type [Domain]
Contingent Consideration Type [Domain]
November 2015 or the successful sale of the plant
Milestone Two [Member]
Milestone Two [Member]
Achievement of Milestones
Achievement of Milestones [Member]
Achievement of Milestones [Member]
Secured Debt
Secured Debt [Member]
Carlyle Group
Carlyle Group [Member]
Carlyle Group [Member]
Connecticut Light and Power
Connecticut Light and Power [Member]
Connecticut Light and Power [Member]
Percentage of ownership
Percentage of Ownership
Percentage of Ownership
Capacity of power plant
Capacity of Power Plant
Capacity of Power Plant
Percentage of power to be purchased
Percentage of Power to be Purchased
Percentage of Power to be Purchased
Term of agreement
Term of Agreement
Term of Agreement
Fuel supply agreement, term
Fuel Supply Agreement, Term
Fuel Supply Agreement, Term
Receivable due from Plainfield
Number of debt instruments financed by Carlyle Grp
Number of Debt Instruments
Number of Debt Instruments
Senior notes, face amount
Repayment of principal
Early Repayment of Debt, Principal
Early Repayment of Debt, Principal
Repayment of debt
Early Repayment of Senior Debt
Interest expense
Early termination fees
Early Termination Fees
Early Termination Fees
Bad debt expense
Proceeds from U.S. Treasury cash grant
Proceeds from Government Grant
Proceeds from Government Grant
Deferred tax assets
Deferred Tax Assets, Gross
Asset impairment charges
Tangible Asset Impairment Charges
Disposal Group, Including Discontinued Operation, Consideration
Disposal Group, Including Discontinued Operation, Consideration
Proceeds from Divestiture of Interest in Consolidated Subsidiaries
Proceeds from Divestiture of Interest in Consolidated Subsidiaries
Promissory note, net received for disposition of business
Noncash or Part Noncash Divestiture, Amount of Consideration Received
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Earn-out Payment
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Earn-out Payment
Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Earn-out Payment
Note Receivable, Option to Extend for One Year Period, Number
Note Receivable, Option to Extend for One Year Period, Number
Note Receivable, Option to Extend for One Year Period, Number of Extensions
Note Receivable, Interest Rate, Stated Percentage
Note Receivable, Interest Rate, Stated Percentage
Note Receivable, Interest Rate, Stated Percentage
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended Beyond July Twenty Four Twenty Seventeen
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended Beyond July Twenty Four Twenty Seventeen
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended Beyond July Twenty Four Twenty Nineteen
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended Beyond July Twenty Four Twenty Nineteen
Note Receivable, Interest Rate, Stated Percentage, If Maturity is Extended Beyond July Twenty Four Twenty Nineteen
Acquisitions
Business Combination Disclosure [Text Block]
Document Documentand Entity Information [Abstract]
Document Documentand Entity Information [Abstract]
Entities [Table]
Entities [Table]
Document Information [Line Items]
Document Information [Line Items]
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Trading Symbol
Trading Symbol
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Current Reporting Status
Entity Current Reporting Status
Entity Voluntary Filers
Entity Voluntary Filers
Entity Filer Category
Entity Filer Category
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Entity Public Float
Entity Public Float
Accrued vacation and bonuses
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences
Investments
Deferred Tax Assets, Investment in Subsidiaries
Deferred compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation
Vesting stock awards
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost
Credits and net operating losses carryovers
Deferred Tax Assets, Tax Credit and Net Operating Loss Carryforwards
Deferred Tax Assets, Tax Credit and Net Operating Loss Carryforwards
Employee benefit contributions
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits
Capital loss carryover
Deferred Tax Assets, Capital Loss Carryforwards
Reserves
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Loss Reserves
Deferred rent and tenant allowances
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent
Other
Deferred Tax Assets, Other
Total deferred tax assets
Valuation allowance
Deferred Tax Assets, Valuation Allowance
Deferred tax assets, net of valuation allowance
Deferred Tax Assets, Net of Valuation Allowance
Deferred revenue
Deferred Tax Liabilities, Tax Deferred Income
Fixed asset basis differences
Deferred Tax Liabilities, Property, Plant and Equipment
Purchased intangible assets
Deferred Tax Liabilities, Intangible Assets
Partnership interest
Deferred Tax Liabilities, Partnership Interest
Deferred Tax Liabilities, Partnership Interest
Employee benefit contributions
Deferred Tax Liability, Tax Deferred Expenses, Compensation and Benefits, Employee Benefit Contributions
Deferred Tax Liability, Tax Deferred Expenses, Compensation and Benefits, Employee Benefit Contributions
Other
Deferred Tax Liabilities, Other
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Goodwill [Line Items]
Goodwill [Line Items]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Beginning balance, Goodwill
Goodwill
Goodwill impairment
Ending balance, Goodwill
Operating lease Commitment
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2017
Operating Leases, Future Minimum Payments, Due in Two Years
2018
Operating Leases, Future Minimum Payments, Due in Three Years
2019
Operating Leases, Future Minimum Payments, Due in Four Years
2020
Operating Leases, Future Minimum Payments, Due in Five Years
2021 and thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Total
Operating Leases, Future Minimum Payments Due
Sublease receipts
Operating Leases, Future Minimum Payments Receivable [Abstract]
2016
Operating Leases, Future Minimum Payments Receivable, Current
2017
Operating Leases, Future Minimum Payments Receivable, in Two Years
2018
Operating Leases, Future Minimum Payments Receivable, in Three Years
2019
Operating Leases, Future Minimum Payments Receivable, in Four Years
2020
Operating Leases, Future Minimum Payments Receivable, in Five Years
2021 and thereafter
Operating Leases, Future Minimum Payments Receivable, Thereafter
Total
Operating Leases, Future Minimum Payments Receivable
Type of Arrangement and Non-arrangement Transactions [Axis]
Type of Arrangement and Non-arrangement Transactions [Axis]
Arrangements and Non-arrangement Transactions [Domain]
Arrangements and Non-arrangement Transactions [Domain]
Group One [Member]
Group One [Member]
Group One [Member]
SAIC Adjustment
Scenario, Adjustment [Member]
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
2006 Equity Incentive Plan
Two Thousand Six Equity Incentive Plan [Member]
Two Thousand Six Equity Incentive Plan [Member]
Employee Stock Purchase Plan
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan [Member]
Title of Individual [Axis]
Title of Individual [Axis]
Title of Individual with Relationship to Entity [Domain]
Relationship to Entity [Domain]
Outside Directors
Outside Directors [Member]
Outside Directors [Member]
Stock issued to Leidos shareholder upon divestiture of SAIC, ratio
Stock Conversion Upon Divestiture
Stock Conversion Upon Divestiture
Period of exercise of vested options after participants death or disability (in months)
Period Of Exercise Of Vested Options After Participants Death Or Disability
Period Of Exercise Of Vested Options After Participants Death Or Disability
Stock awards exercisable period (in months)
Stock Awards Exercisable Period
Stock Awards Exercisable Period
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
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
Percentage of stock awards vest or exercisable, every year
Percentage Of Stock Awards Vest Or Exercisable
Percentage Of Stock Awards Vest Or Exercisable
Vesting period (in years)
Stock reserved for future issuance
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Percentage of stock compensation plans awards that vest after January 1, 2006
Percentage Of Stock Compensation Plans Awards Vest After Vesting Period
Percentage Of Stock Compensation Plans Awards Vest After Certain Date
Percentage of market price per share for stock purchase program
Percentage Of Market Price of Shares For Stock Purchase Program
Percentage Of Market Price of Shares For Stock Purchase Program
Percentage of market price for employee purchase program for stock purchases during non-compensatory period
Percentage Of Market Price During Non Compensatory Period
Percentage Of Market Price During Non Compensatory Period
Shares authorized and reserved for future issuance under the ESPP
Common Stock, Capital Shares Reserved for Future Issuance
Increase of expense related to the modification
Allocated Share-based Compensation Expense, Additional, Vested Awards
Allocated Share-based Compensation Expense, Additional, Vested Awards
Additional incremental fair value
Allocated Share-based Compensation Expense, Additional, Unvested Awards
Allocated Share-based Compensation Expense, Additional, Unvested Awards
Weighted average modification fair value (per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value, Modification
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value, Modification
Unrecognized compensation cost, net of estimated forfeitures
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
Expected weighted-average period of recognition, years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options
Stock exchanged at fair value upon exercises of stock options
Stock Cancelled To Cover Price Of Options Exercises
No authoritative reference available.
Maximum percentage that will ultimately be awarded
Maximum Percentage That Will Ultimately Vest For Shares Provided Under Long Term Performance Based Incentive Equity Awards Based On Target Amount Stated In Agreement
Maximum Percentage That Will Ultimately Vest for Shares Provided Under Long Term Performance Based Incentive Equity Awards Based on Target Amount Stated in Agreement
Weighted average grant date fair value of the awards granted, excluding dividend equivalents (per share)
Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Excluding Dividends Equivalents, Weighted Average Grant Date Fair Value
Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Excluding Dividends Equivalents, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, Awards 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 Stock Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Stock Price
Basic weighted average number of shares outstanding
Weighted Average Number of Shares Outstanding, Basic
Dilutive common share equivalents—stock options and other stock awards
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Diluted weighted average number of shares outstanding
Weighted Average Number of Shares Outstanding, Diluted
Antidilutive stock based awards
Participating Securities Distributed and Undistributed Earnings Loss Basic and Participating Securities Distributed and Undistributed Earnings Loss Diluted
Participating Securities Distributed and Undistributed Earnings Loss Basic and Participating Securities Distributed and Undistributed Earnings Loss Diluted
Consolidation Items [Axis]
Consolidation Items [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
Operating Segments
Operating Segments [Member]
Intersegment Eliminations
Consolidation, Eliminations [Member]
National Security Solutions
Health and Engineering
Corporate and Other
Corporate and Other [Member]
Operating income (loss)
Amortization of intangible assets
Legal Entity [Axis]
Cash flows from operating activities of continuing operations:
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Loss (income) from discontinued operations
Adjustments to reconcile net income (loss) to net cash provided by continuing operations:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization
Stock-based compensation
Share-based Compensation
Asset impairment charges
Restructuring charges
Restructuring Costs
(Gain) loss on a real estate sale
Bad debt expense
Provision for Doubtful Accounts and Other Expense
Provision for Doubtful Accounts and Other Expense
Change in assets and liabilities, net of effects of acquisitions and dispositions:
Increase (Decrease) in Operating Capital [Abstract]
Receivables
Increase (Decrease) in Receivables
Inventory, prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Income taxes receivable/payable
Increase (Decrease) in Income Taxes Payable
Deferred income taxes
Increase (Decrease) in Deferred Income Taxes
Other assets
Increase (Decrease) in Other Operating Assets
Accounts payable and accrued liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Accrued payroll and employee benefits
Increase (Decrease) in Employee Related Liabilities
Other long-term liabilities
Total cash flows provided by operating activities of continuing operations
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
Cash flows from investing activities of continuing operations:
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Proceeds on obligations of Leidos Holdings, Inc.
Proceeds from Related Party Debt, Investing Activity
Proceeds from Related Party Debt, Investing Activity
Payments on obligations of Leidos Holdings, Inc.
Repayments of Related Party Debt, Investing Activity
Repayments of Related Party Debt, Investing Activity
Expenditures for property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Acquisitions of businesses, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Payments on accrued purchase price related to prior acquisition
Payments for (Proceeds from) Previous Acquisition
Net proceeds from sale of assets
Proceeds from Sale of Property, Plant, and Equipment
Proceeds from disposition of business, net of cash sold of $2 million
Proceeds from Divestiture of Businesses, Net of Cash Divested
Net proceeds of cost method investments
Net Proceeds (Purchases) of Cost Method Investments
Net Proceeds (Purchases) of Cost Method Investments
Dividend received from the separation of New SAIC
Contribution paid related to the separation of New SAIC
Payments for Divestiture of Business
Payments for Divestiture of Business
Other
Payments for (Proceeds from) Other Investing Activities
Total cash flows provided by investing activities of continuing operations
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
Cash flows from financing activities of continuing operations:
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Payments on notes payable and long-term debt
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities
Payments for deferred financing costs
Payments of Financing Costs
Payment from New SAIC for deferred financing costs
Proceeds from Repayment of Financing Costs
Proceeds from Repayment of Financing Costs
Payments on real estate financing transaction
Payments for Lease Termination Fees
Payments for Lease Termination Fees
Proceeds from debt issuance
Proceeds from Issuance of Debt
Distribution of debt to New SAIC
Transfer of Debt on Spin-off
Transfer of Debt on Spin-off
Sales of stock and exercises of stock options
Proceeds from Issuance or Sale of Equity
Repurchases of stock and stock received for tax withholdings
Payments for Repurchase of Equity
Dividend payments
Payments of Dividends
Other
Proceeds from (Payments for) Other Financing Activities
Total cash flows used in financing activities of continuing operations
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
Increase (decrease) in cash and cash equivalents from continuing operations
Net Cash Provided by (Used in) Continuing Operations
Cash flows from discontinued operations:
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
(Decrease) increase in cash and cash equivalents from discontinued operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash (used in) provided by operating activities of discontinued operations
Cash Provided by (Used in) Investing Activities, Discontinued Operations
(Decrease) increase in cash and cash equivalents from discontinued operations
Net Cash Provided by (Used in) Discontinued Operations
Total increase (decrease) in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of year
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents at end of year
Quarterly Financial Information [Table]
Quarterly Financial Information [Table]
Quarterly Financial Information [Table]
Quarterly Financial Information [Line Items]
Quarterly Financial Information [Line Items]
Quarterly Financial Information [Line Items]
Gain (Loss) on Sale of Properties
Separation transaction expenses, net of tax
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility
Revolving Credit Facility [Member]
Revolving credit facility financial covenants description
Line of Credit Facility, Covenant Compliance
Ratio of consolidated funded debt to EBITDA,Until Jan 29, 2016 numerator, maximum
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization Numerator Maximum, Until January Twenty Nine Twenty Sixteen
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization Numerator Maximum, Until January Twenty Nine Twenty Sixteen
Ratio of consolidated funded debt to EBITDA, numerator, maximum
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization Numerator Maximum
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization, Numerator, Maximum
Ratio of consolidated funded debt to EBITDA, denominator, maximum
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization Denominator Maximum
Ratio Of Consolidated Funded Debt To Earnings Before Interest Taxes Depreciation And Amortization Denominator, Maximum
Minimum ratio of EBITDA to interest expense, numerator
Minimum Ratio Of Earnings Before Interest Taxes Depreciation And Amortization To Interest Expense Numerator
Minimum Ratio Of Earnings Before Interest Taxes Depreciation And Amortization To Interest Expense Numerator
Minimum ratio of EBITDA to interest expense, denominator
Minimum Ratio Of Earnings Before Interest Taxes Depreciation And Amortization To Interest Expense Denominator
Minimum Ratio Of Earnings Before Interest Taxes Depreciation And Amortization To Interest Expense Denominator
Operating income
Income (loss) from continuing operations
Income from discontinued operations
Basic earnings (loss) per share ( usd per share)
Diluted earnings (loss) per share ( usd per share)
Dispositions
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Capital leases and other notes payable due on various dates through fiscal 2020
Capital Leases And Other Notes Payable Due On Various Dates Through Fiscal Two Thousand Twenty [Member]
Capital Leases And Other Notes Payable Due On Various Dates Through Fiscal Two Thousand Twenty One [Member]
Other notes payable due on various dates through fiscal 2021
Other Notes Payable
Total notes payable and long-term debt
Long-term Debt and Capital Lease Obligations, Including Current Maturities
Total notes payable and long-term debt, net of current portion
Long-term Debt and Capital Lease Obligations
Less current portion
Long-term Debt and Capital Lease Obligations, Current
Fair value of notes payable and long-term debt
Debt Instrument, Fair Value Disclosure
Effective interest rate
Debt Instrument, Interest Rate, Effective Percentage
Minimum stated interest rate
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum
Maximum stated interest rate
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum
Senior unsecured notes, face amount
Debt maturity date
Debt Instrument, Maturity Date
Interest rate swaps
Interest Rate Swap [Member]
Notes payable and long-term debt, net of current portion
Notes Payable and Long Term Debt, Net of Current Portion [Member]
Notes Payable and Long Term Debt, Net of Current Portion [Member]
Other assets
Other Assets [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument
Designated as Hedging Instrument [Member]
Hedged instrument, face amount
Derivative Liability, Notional Amount
Stated interest rate
Derivative, Fixed Interest Rate
Notes payable and long-term debt, net of current portion
Long-term Debt, Fair Value
Other assets
Derivative Asset, Fair Value, Gross Asset
Vested stock issued as settlement of annual bonus accruals
Stock Issued, Vested Stock Issued As Settlement Of Annual Bonus Accruals
Stock Issued, Vested Stock Issued as Settlement of Annual Bonus Accruals.
Stock issued in lieu of cash dividends
Stock Issued, In Lieu of Cash Dividend
Stock Issued, In Lieu of Cash Dividend
Capital lease obligations
Capital Lease Obligations Incurred
Promissory note, net received from a real estate sale
Other Significant Noncash Transaction, Value of Consideration Received
Fair value of assets acquired in acquisitions
Fair Value of Assets Acquired
Cash paid in acquisitions
Payments to Acquire Businesses, Gross
Forgiveness of accounts receivable to acquire equity interest in business combination
Accrued liability for acquisition of business
Noncash or Part Noncash Acquisition, Payables Assumed
Liabilities assumed in acquisitions
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed
Cash paid for interest (including discontinued operations)
Interest Paid
Cash paid for income taxes, net of refunds (including discontinued operations)
Income Taxes Paid
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments, net of taxes of $0 million as of January 1, 2016 and January 30, 2015, respectively
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Unrecognized net loss on settled derivative instruments associated with outstanding debt, net of taxes of $3 million as of January 1, 2016 and January 30, 2015, respectively
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Unrecognized net loss on defined benefit plan, net of taxes of $3 million and $5 million as of January 1, 2016 and January 30, 2015, respectively
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax
Total accumulated other comprehensive loss, net of taxes of $6 million and $8 million as of January 1, 2016 and January 30, 2015, respectively
Accumulated Other Comprehensive Income (Loss), Net of Tax
Class of Treasury Stock [Table]
Class of Treasury Stock [Table]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Third Accelerated Share Repurchase [Member]
Third Accelerated Share Repurchase [Member]
Third Accelerated Share Repurchase [Member]
Second Accelerated Share Repurchase [Member]
Second Accelerated Share Repurchase [Member]
Second Accelerated Share Repurchase [Member]
Second Accelerated Share Repurchase, Initial Delivery [Member]
Second Accelerated Share Repurchase, Initial Delivery [Member]
Second Accelerated Share Repurchase, Initial Delivery [Member]
Second Accelerated Share Repurchase, Final Delivery [Member]
Second Accelerated Share Repurchase, Final Delivery [Member]
Second Accelerated Share Repurchase, Final Delivery [Member]
Accelerated Share Repurchase (ASR)
Accelerated Share Repurchase [Member]
Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Equity, Class of Treasury Stock [Line Items]
Agreement to repurchase shares, amount
Stock Repurchase Program, Authorized Amount
Number of shares repurchased and retired
Amount paid to repurchase outstanding shares
Value of initial shares repurchased
Forward contract indexed to our common stock
Forward Contract Indexed to Issuer's Equity, Amount
Forward Contract Indexed to Issuer's Equity, Amount
Subsequent Events
Subsequent Events [Text Block]
Schedule of Stock-Based Compensation and Related Tax Benefits Recognized
Schedule Of Share Based Compensation And Related Tax Benefits Recognized Table [Text Block]
Schedule Of Share Based Compensation And Related Tax Benefits Recognized
Schedule of Weighted Average Grant-Date Fair Value And Assumptions Used
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Options Outstanding
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Schedule of Vesting Stock Award Activity
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
Schedule of Performance-Based Stock Award Activity
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]
Gross rental expense
Operating Leases, Rent Expense, Minimum Rentals
Less lease and sublease income
Operating Leases, Income Statement, Sublease Revenue
Net rental expense
Operating Leases, Rent Expense
Note Payable and Long-Term Debt
Long-term Debt, Unclassified [Abstract]
2016
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2017
Long-term Debt, Maturities, Repayments of Principal in Year Two
2018
Long-term Debt, Maturities, Repayments of Principal in Year Three
2019
Long-term Debt, Maturities, Repayments of Principal in Year Four
2020
Long-term Debt, Maturities, Repayments of Principal in Year Five
2021 and thereafter
Long-term Debt, Maturities, Repayments of Principal after Year Five
Total principal payments
Long Term Debt Before Unamortized Discount
Long Term Debt Before Unamortized Discount
Less unamortized discount
Debt Instrument, Unamortized Discount
Earnings (Loss) Per Share (EPS)
Earnings Per Share [Text Block]
Schedule of Discontinued Operations
Disposal Groups, Including Discontinued Operations [Table Text Block]
Stock Split
Successor [Member]
Shares of stock under stock awards
Awards granted (in shares)
Awards forfeited (in shares)
Spin-off Adjustment (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Separation Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Separation Adjustment
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]
Weighted average grant-date fair value, Awards granted (in dollars per share)
Weighted average grant-date fair value, Awards forfeited (in dollars per share)
Weighted average grant-date fair value, Spin-off Adjustment (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Separation Agreement, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Separation Agreement, Weighted Average Grant Date Fair Value
Stock-Based Compensation [Abstract]
Share-based Compensation [Abstract]
Shares of stock under stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Options granted
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Special dividend adjustments
Share Based Compensation Arrangement By Share Based Payment Award Options Adjustment For Special Cash Dividend
Share Based Compensation Arrangement By Share Based Payment Award Options Adjustment For Special Cash Dividend
Options forfeited or expired
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period
Options exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Spin-off Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Options, Separation Adjustments
Share-based Compensation Arrangement by Share-based Payment Award, Options, Separation Adjustment
Outstanding, ending balance
Exercisable at year end
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Vested and expected to vest in the future as of year end
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Weighted average exercise price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Exercisable at year end
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Options granted
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Options forfeited or expired
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Options exercised
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Outstanding, ending balance
Spin-off Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Options, Separation Agreement, Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Separation Agreement, Weighted Average Exercise Price
Vested and expected to vest in the future as of year end
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price
Weighted average remaining contractual term and Aggregate intrinsic value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term, Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Weighted average remaining contractual term, Exercisable at year end
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term 2
Share based Compensation Arrangement By Share based Payment Award Options Exercisable Weighted Average Remaining Contractual Term 2
Weighted average remaining contractual term, Vested and expected to vest, years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term
Aggregate intrinsic value, Outstanding, beginning balance
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Aggregate intrinsic value, Outstanding, Option Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Aggregate intrinsic value, Outstanding, ending balance
Aggregate intrinsic value, Exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Aggregate intrinsic value, Outstanding, Vested and expected to vest
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value
Property, plant and equipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets
Notes payable assumed (net of debt discount)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities
Total identifiable net assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Intangible assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Discontinued Operation
Revenues
Disposal Group, Including Discontinued Operation, Revenue
Cost of revenues
Disposal Group, Including Discontinued Operation, Costs of Goods Sold
Selling, general and administrative expenses
Disposal Group, Including Discontinued Operation, Selling, General and Administrative Expense
Disposal Group, Including Discontinued Operation, Selling, General and Administrative Expense
Operating income
Disposal Group, Including Discontinued Operation, Operating Income (Loss)
Nonoperating Income (Expense)
Nonoperating Income (Expense)
(Loss) income from discontinued operations before income taxes
Selected Quarterly Financial Data (Unaudited)
Quarterly Financial Information [Text Block]
ASSETS
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Receivables, net
Receivables, Net, Current
Inventory, prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Assets of discontinued operations
Disposal Group, Including Discontinued Operation, Assets, Current
Total current assets
Assets, Current
Property, plant and equipment, net
Goodwill and intangible assets, net
Intangible Assets, Net (Including Goodwill)
Other assets
Other Assets, Noncurrent
Note receivable from Leidos Holdings, Inc. (Note 10)
Notes Receivable, Related Parties, Noncurrent
Total assets
Assets
LIABILITIES AND STOCKHOLDER’S EQUITY
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Accounts payable and accrued liabilities
Accrued payroll and employee benefits
Notes payable and long-term debt, current portion
Debt, Current
Liabilities of discontinued operations
Disposal Group, Including Discontinued Operation, Liabilities, Current
Total current liabilities
Liabilities, Current
Notes payable and long-term debt, net of current portion
Other long-term liabilities
Commitments and contingencies (Notes 16,19 and 20)
Commitments and Contingencies
Stockholder's equity:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, $.0001 par value,10 million shares authorized and no shares issued and outstanding at January 1, 2016 and January 30, 2015
Preferred Stock, Value, Issued
Common stock
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Accumulated earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Total stockholder's equity
Total liabilities and stockholders' equity
Liabilities and Equity
Pension and Other Postretirement Benefits Disclosure [Table]
Pension And Other Postretirement Benefits Disclosure [Table]
Pension and Other Postretirement Benefits Disclosure [Table]
Postretirement Benefits, Type of Deferred Compensation [Axis]
Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Axis]
Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain]
Deferred Compensation Plans
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension And Other Postretirement Benefits Disclosure [Line Items]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Compensation expense
Defined Contribution Plan, Cost Recognized
Maximum percentage certain employees can defer from salary for certain plans
Participants Maximum Percentage Of Eligible Salary Defer
Participants maximum percentage that an employee can defer of their eligible salary for 401 (k) plan.
Projected benefit obligation
Defined Benefit Plan, Benefit Obligation
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)
Defined Benefit Plan, Actuarial Gain (Loss)
Defined Benefit Plan, Actuarial Gain (Loss)
Fair value of plan assets
Defined Benefit Plan, Fair Value of Plan Assets
Funded status of plan
Defined Benefit Plan, Funded Status of Plan