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Goodwill and Intangible Assets (Additional Information) (Detail) (USD $)
 3 Months Ended 12 Months Ended
Apr. 03, 2015
May 02, 2014
Jan. 30, 2015
Goodwill [Line Items]      
Goodwill impairment charges $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 486,000,000us-gaap_GoodwillImpairmentLoss
Amortization expense related to amortizable intangible assets 2,000,000us-gaap_AmortizationOfIntangibleAssets 5,000,000us-gaap_AmortizationOfIntangibleAssets  
NSS      
Goodwill [Line Items]      
Goodwill impairment charges     0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldos_NationalSecuritySolutionsMember
HES      
Goodwill [Line Items]      
Goodwill impairment charges     $ 486,000,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= ldos_HealthandEngineeringMember
Software and Technology      
Goodwill [Line Items]      
Useful life of intangible 9 years