Net Income Per Share - Schedule of Weighted-Average Shares Used for Net Income per Share (Detail) - shares	3 Months Ended								12 Months Ended
	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Earnings Per Share [Abstract]
Weighted-average shares—basic	21,418,283	21,221,848	28,398,307	37,609,516	40,803,626	40,730,059	40,646,124	40,588,081	27,053,616	40,691,483	40,190,448
Effect of dilutive stock-based awards									2,199,592	235,357	2,066,111
Weighted-average shares—diluted	25,666,174	23,535,617	28,398,307	37,609,516	41,000,760	40,926,450	40,820,495	40,588,081	29,253,208	40,926,840	42,256,559