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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
Feb. 01, 2020
Sep. 30, 2019
Feb. 02, 2019
Jun. 30, 2018
Aug. 01, 2015
Jun. 30, 2015
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 2024            
Liability component            
Less: Debt discount   $ (3,500)        
Convertible senior notes due 2023            
Liability component            
Principal 335,000   $ 335,000      
Less: Debt discount (64,729)   (81,311) $ (1,700)    
Net carrying amount 270,271   253,689      
Equity component 90,990   90,990      
Convertible senior notes due 2020            
Liability component            
Principal 300,000   300,000   $ 300,000  
Less: Debt discount (8,890)   (27,081)     $ (3,800)
Net carrying amount 291,110   272,919      
Equity component $ 84,003   $ 84,003