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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 04, 2019
Feb. 02, 2019
Jun. 30, 2018
Jun. 30, 2015
Convertible senior notes due 2023        
Liability component        
Principal $ 335,000 $ 335,000    
Less: Debt discount (77,264) (81,311) $ (1,700)  
Net carrying amount 257,736 253,689    
Equity component 90,990 90,990    
Convertible senior notes due 2020        
Liability component        
Principal 300,000 300,000    
Less: Debt discount (22,642) (27,081)   $ (3,800)
Net carrying amount 277,358 272,919    
Equity component $ 84,003 $ 84,003