Net Income Per Share - Schedule of Weighted-Average Shares Used for Net Income per Share (Detail) - shares		3 Months Ended								12 Months Ended
		Feb. 02, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017
Earnings Per Share [Abstract]
Weighted-average shares—basic		20,901,841	22,082,141	21,925,702	21,545,025	21,418,283	21,221,848	28,398,307	37,609,516	21,613,678	27,053,616	40,691,483
Effect of dilutive stock-based awards										4,567,303	2,199,592	235,357
Effect of dilutive convertible senior notes	[1]									352,244
Weighted-average shares—diluted		25,702,791	27,703,319	27,496,561	25,230,228	25,666,174	23,535,617	28,398,307	37,609,516	26,533,225	29,253,208	40,926,840

[1] The 2019 Notes, 2020 Notes and 2023 Notes have an impact on the Company’s dilutive share count beginning at stock prices of $116.09 per share, $118.13 per share and $193.65 per share, respectively.