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Debt (Revolving Credit Facility) (Detail) (USD $)
12 Months Ended
Jan. 30, 2015
Jun. 30, 2013
Jan. 31, 2014
Debt Instrument [Line Items]      
Unsecured borrowing capacity   $ 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Revolving credit facility financial covenants description For a period of four trailing fiscal quarters, the Company maintains a ratio of consolidated funded debt, including borrowings under this credit facility, to earnings before interest, taxes, depreciation and amortization (EBITDA) adjusted for other items as defined in the credit facility of not more than 3.0 to 1.0 and a ratio of EBITDA adjusted for other items as defined in the credit facility to interest expense of greater than 3.5 to 1.0.    
Ratio of consolidated funded debt to EBITDA,Until Jan 29, 2016 numerator, maximum 4ldos_RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationNumeratorMaximumUntilJanuaryTwentyNineTwentySixteen    
Ratio of consolidated funded debt to EBITDA, numerator, maximum 3.75ldos_RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationNumeratorMaximum    
Ratio of consolidated funded debt to EBITDA, denominator, maximum 1ldos_RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationDenominatorMaximum    
Minimum ratio of EBITDA to interest expense, numerator 3.5ldos_MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseNumerator    
Minimum ratio of EBITDA to interest expense, denominator 1ldos_MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseDenominator    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Unsecured borrowing capacity 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  $ 750,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember