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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Aug. 04, 2018
USD ($)
$ / shares
shares
Options  
Outstanding - beginning of period | shares 2,190
Granted | shares 715
Exercised | shares (991) [1]
Outstanding- end of period | shares 1,914
Vested and expected to vest-end of period | shares 1,681
Exercisable-end of period | shares 174 [2]
Weighted-Average Exercise Price  
Outstanding-beginning of period | $ / shares $ 14.59
Granted | $ / shares 19.60
Exercised | $ / shares 15.59 [1]
Outstanding-end of period | $ / shares 16.76
Vested and expected to vest-end of period | $ / shares 17.06
Exercisable-end of period | $ / shares $ 15.00 [2]
Weighted-Average Remaining Contractual Term (In years)  
Outstanding-end of period 5 years 9 months 18 days
Vested and expected to vest-end of period 5 years 9 months 18 days
Exercisable-end of period 5 years 2 months 12 days [2]
Aggregate Intrinsic Value  
Outstanding-end of period | $ $ 16,831
Vested and expected to vest-end of period | $ 13,628
Exercisable-end of period | $ $ 1,836 [2]
[1] Options exercised during the 26 weeks ended August 4, 2018 had exercise prices ranging from $13.70 to $15.89.
[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 on August 4, 2018.