Summary of Stock Option Activity (Parenthetical) (Detail) |
12 Months Ended |
|---|---|
|
Jan. 28, 2017
$ / shares
| |
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
| Options exercised, exercise price range, lower limit | $ 11.51 |
| Options exercised, exercise price range, upper limit | $ 15.81 |