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Business Overview and Summary of Significant Accounting Policies (Detail 1)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 05, 2016
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
Aug. 05, 2016
USD ($)
Segment
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
May 04, 2015
Significant Accounting Policies [Line Items]          
Number of reportable segments | Segment     1    
Increase (decrease) in operating income due to aggregate changes in contract estimates | $ $ 7 $ 7 $ 13 $ 8  
Increase (decrease) in diluted earnings per share due to aggregate changes in contract estimates | $ / shares $ 0.10 $ 0.08 $ 0.18 $ 0.10  
Operating cycle (in years)     greater than one year    
Scitor Holdings, Inc.          
Significant Accounting Policies [Line Items]          
Definitive agreement to acquire business, Percentage of acquisition         100.00%