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Business Overview and Summary of Significant Accounting Policies (Detail 1)
12 Months Ended
Feb. 03, 2017
USD ($)
Segment
Jan. 29, 2016
USD ($)
Jan. 30, 2015
USD ($)
May 04, 2015
Significant Accounting Policies [Line Items]        
Number of operating segments | Segment 5      
Number of reportable segments | Segment 1      
Minimum percentage of likelihood of the largest amount of benefit being realized upon settlement with tax authorities 50.00%      
Unbilled receivables, maximum expected period for billing and collection 1 year      
Amount of progress payments received are offset against unbilled receivables $ 56,000,000 $ 0    
Impairment of goodwill and intangible assets $ 0 0    
Operating cycle (in years) greater than one year      
Internal research and development costs included in selling, general and administrative expenses $ 4,000,000 4,000,000 $ 5,000,000  
Scitor Holdings, Inc.        
Significant Accounting Policies [Line Items]        
Definitive agreement to acquire business, Percentage of acquisition       100.00%
Scitor Holdings, Inc. | Rabbi Trust        
Significant Accounting Policies [Line Items]        
Restricted cash 8,000,000 14,000,000    
Scitor Holdings, Inc. | Other Current Assets | Rabbi Trust        
Significant Accounting Policies [Line Items]        
Restricted cash 1,000,000 7,000,000    
Scitor Holdings, Inc. | Other Assets | Rabbi Trust        
Significant Accounting Policies [Line Items]        
Restricted cash $ 7,000,000 $ 7,000,000