Debt - Summary of Total Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of debt discount and debt issuance costs including initial purchaser discount			$ 10,376	$ 9,639
0.25% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate	0.25%	0.25%	0.25%	0.25%
0.25% contractual coupon	$ 220	$ 221	$ 441	$ 441
Amortization of debt discount and debt issuance costs including initial purchaser discount	3,446	3,291	6,852	6,546
Interest expense	$ 3,666	$ 3,512	$ 7,293	$ 6,987