XML 88 R1.htm IDEA: XBRL DOCUMENT v2.4.1.9
Document and Entity Information (USD $)
 12 Months Ended
Jan. 30, 2015
Mar. 16, 2015
Aug. 01, 2014
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 30, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol LDOS    
Entity Registrant Name Leidos Holdings, Inc.    
Entity Central Index Key 0001336920    
Current Fiscal Year End Date --01-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   74,124,812dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 2,701,960,753dei_EntityPublicFloat
Leidos, Inc.      
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 30, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Registrant Name LEIDOS, INC.    
Entity Central Index Key 0000353394    
Current Fiscal Year End Date --01-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   5,000dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember