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Convertible Senior Notes - Carrying Value of Notes Excluding the Discounts and Commissions Payable to the Initial Purchasers and Third Party Offering Costs (Detail) - USD ($)
$ in Thousands
Feb. 01, 2020
Sep. 30, 2019
Feb. 02, 2019
Jun. 30, 2014
Liability component        
Principal $ 350,000 $ 350,000    
Less: Debt discount (81,634)      
Net carrying amount 268,366      
Equity component $ 87,252      
Convertible senior notes due 2019        
Liability component        
Principal     $ 350,000 $ 350,000
Less: Debt discount     (5,854) $ (4,400)
Net carrying amount     344,146  
Equity component     $ 70,482