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Fair Value Measurements - Estimated Fair Value and Carrying Value of Notes (Detail) - USD ($)
$ in Thousands
Feb. 01, 2020
Feb. 02, 2019
Convertible senior notes due 2019    
Fair Value Balance Sheet Grouping Financial Statement Captions    
Convertible senior notes, Fair Value   $ 334,756
Convertible senior notes, Carrying Value   344,146
Convertible senior notes due 2020    
Fair Value Balance Sheet Grouping Financial Statement Captions    
Convertible senior notes, Fair Value $ 295,573 260,258
Convertible senior notes, Carrying Value 291,110 272,919
Convertible senior notes due 2023    
Fair Value Balance Sheet Grouping Financial Statement Captions    
Convertible senior notes, Fair Value 272,623 230,684
Convertible senior notes, Carrying Value 270,271 $ 253,689
Convertible senior notes due 2024    
Fair Value Balance Sheet Grouping Financial Statement Captions    
Convertible senior notes, Fair Value 255,849  
Convertible senior notes, Carrying Value $ 268,366