Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 30, 2016 USD ($) $ / shares shares
Options
Outstanding - beginning of period | shares	1,213
Granted | shares	2,211
Exercised | shares	121	[1]
Cancelled | shares	42
Outstanding- end of period | shares	3,261
Vested and expected to vest-end of period | shares	3,079
Exercisable-end of period | shares	1,036	[2]
Weighted-Average Exercise Price
Outstanding-beginning of period | $ / shares	$ 14.83
Granted | $ / shares	15.35
Exercised | $ / shares	13.74	[1]
Cancelled | $ / shares	14.50
Outstanding-end of period | $ / shares	15.23
Vested and expected to vest-end of period | $ / shares	15.22
Exercisable-end of period | $ / shares	$ 14.90	[2]
Weighted-Average Remaining Contractual Term (In years)
Outstanding-end of period	4 years 9 months 18 days
Vested and expected to vest-end of period	4 years 8 months 12 days
Exercisable-end of period	7 months 6 days	[2]
Aggregate Intrinsic Value
Outstanding-end of period | $	$ 8,802
Vested and expected to vest-end of period | $	8,336
Exercisable-end of period | $	$ 3,125	[2]

[1] Options exercised during the 26 weeks ended July 30, 2016 had exercise prices ranging from $11.50 to $14.50.

[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 30, 2016.