Net Income Per Share - Schedule of Weighted-Average Shares Used for Net Income per Share (Detail) - shares		3 Months Ended		9 Months Ended
		Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017
Earnings Per Share [Abstract]
Weighted-average shares—basic		22,082,141	21,221,848	21,850,955	29,076,556
Effect of dilutive stock-based awards		4,966,376	2,313,769	4,603,390	1,516,826
Effect of dilutive convertible senior notes	[1]	654,802		355,690
Weighted-average shares—diluted		27,703,319	23,535,617	26,810,035	30,593,382

[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