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Convertible Senior Notes - Carrying Values of Notes Excluding the Discounts upon Original Issuance and Third Party Offering Costs (Detail) - USD ($)
$ in Thousands
Aug. 01, 2020
Feb. 01, 2020
Sep. 30, 2019
Jun. 30, 2018
Jun. 30, 2015
Liability component          
Principal $ 350,000 $ 350,000      
Less: Debt discount (73,839) (81,634)      
Net carrying amount 276,161 268,366      
Equity component 87,252 87,252      
Convertible senior notes due 2024          
Liability component          
Less: Debt discount     $ (3,500)    
Convertible senior notes due 2023          
Liability component          
Principal 335,000 335,000   $ 300,000  
Less: Debt discount (56,036) (64,729)   $ (1,700)  
Net carrying amount 278,964 270,271      
Equity component $ 90,990 90,990      
Convertible senior notes due 2020          
Liability component          
Principal   300,000     $ 250,000
Less: Debt discount   (8,890)     $ (3,800)
Net carrying amount   291,110      
Equity component   $ 84,003