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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
May 02, 2020
Feb. 01, 2020
Sep. 30, 2019
Jun. 30, 2018
Aug. 01, 2015
Jun. 30, 2015
Liability component            
Principal $ 350,000 $ 350,000        
Less: Debt discount (77,764) (81,634)        
Net carrying amount 272,236 268,366        
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 (60,417) (64,729)   $ (1,700)    
Net carrying amount 274,583 270,271        
Equity component 90,990 90,990        
Convertible senior notes due 2020            
Liability component            
Principal 300,000 300,000     $ 300,000 $ 250,000
Less: Debt discount (4,156) (8,890)       $ (3,800)
Net carrying amount 295,844 291,110        
Equity component $ 84,003 $ 84,003