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Summary of Stock Option Activity (Detail)
shares in Thousands
6 Months Ended
Jul. 29, 2017
$ / shares
shares
Options  
Outstanding - beginning of period | shares 2,314
Granted | shares 1,055
Exercised | shares (20) [1]
Cancelled | shares (51)
Outstanding- end of period | shares 3,298
Vested and expected to vest-end of period | shares 3,085
Exercisable-end of period | shares 9 [2]
Weighted-Average Exercise Price  
Outstanding-beginning of period | $ / shares $ 15.33
Granted | $ / shares 14.59
Exercised | $ / shares 11.51 [1]
Cancelled | $ / shares 15.81
Outstanding-end of period | $ / shares 15.11
Vested and expected to vest-end of period | $ / shares 15.12
Exercisable-end of period | $ / shares $ 11.51 [2]
Weighted-Average Remaining Contractual Term (In years)  
Outstanding-end of period 6 years
Vested and expected to vest-end of period 6 years
Exercisable-end of period 0 years [2]
[1] Options exercised during the 26 weeks ended July 29, 2017 had an exercise price of $11.51.
[2] Options exercisable represent “in-the-money” vested options based upon the weighted-average exercise price of vested options compared to the Company’s stock price at July 29, 2017.