Debt - Summary of Total Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Amortization of discount on convertible debt and debt issuance costs			$ 15,920	$ 9,641
0.25% Convertible Senior Note Due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate	0.25%	0.25%	0.25%	0.25%
0.25% contractual coupon	$ 218	$ 216	$ 659	$ 656
Amortization of discount on convertible debt and debt issuance costs	3,294	3,112	9,840	9,367
Interest expense	$ 3,512	$ 3,328	$ 10,499	$ 10,023