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Summary of Total Interest Expense Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]    
Amortization of debt discount and debt issuance costs including initial purchaser discount $ 12,550 $ 10,057
0.25% Convertible Senior Note Due 2022    
Debt Instrument [Line Items]    
0.25% contractual coupon 874 731
Amortization of debt discount and debt issuance costs including initial purchaser discount 12,550 10,058
Interest expense $ 13,424 $ 10,789