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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. 02, 2019
Jun. 30, 2018
Feb. 03, 2018
Jun. 30, 2015
Convertible Senior Notes Due 2023 [Member]        
Liability component        
Principal $ 335,000      
Less: Debt discount (81,311) $ (1,700)    
Net carrying amount 253,689      
Equity component 90,990      
Convertible Senior Notes Due 2020 [Member]        
Liability component        
Principal 300,000   $ 300,000  
Less: Debt discount (27,081)   (44,135) $ (3,800)
Net carrying amount 272,919   255,865  
Equity component $ 84,003   $ 84,003