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Net Income Per Share - Schedule of Weighted-Average Shares Used for Net Income per Share (Detail) - shares
3 Months Ended 6 Months Ended
Aug. 03, 2019
Aug. 04, 2018
Aug. 03, 2019
Aug. 04, 2018
Earnings Per Share [Abstract]        
Weighted-average shares-basic 18,465,876 21,925,702 19,221,367 21,735,364
Effect of dilutive stock-based awards 3,858,236 5,158,591 4,165,391 4,421,897
Effect of dilutive convertible senior notes [1]   412,268 242,292 206,134
Weighted-average shares-diluted 22,324,112 27,496,561 23,629,050 26,363,395
[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