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Convertible Senior Notes - Carrying Value of the 2024 Notes (Detail) - Convertible senior notes due 2024 - USD ($)
$ in Thousands
Jan. 30, 2021
Feb. 01, 2020
Sep. 30, 2019
Liability component      
Principal $ 350,000 $ 350,000 $ 350,000
Less: Debt discount (65,818) (81,634) $ (3,500)
Net carrying amount 284,182 268,366  
Equity component $ 87,252 $ 87,252