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Schedule of Accumulated Other Comprehensive Loss (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 30, 2015
Jan. 31, 2014
Equity [Abstract]    
Foreign currency translation adjustments, tax effect $ 0ldos_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax $ (1)ldos_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Unrecognized net loss on settled derivative instruments associated with outstanding debt, tax effect 3ldos_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTaxEffect 3ldos_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTaxEffect
Unrecognized loss (gain) on defined benefit plan, tax effect 5ldos_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect 2ldos_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect
Total accumulated other comprehensive loss, tax effect $ 8ldos_AccumulatedOtherComprehensiveIncomeLossTax $ 4ldos_AccumulatedOtherComprehensiveIncomeLossTax