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% |