Debt (Long-term debt) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Total Debt:
Long-term Debt, Gross	$ 1,091,750	$ 294,000	$ 454,750
Unamortized debt issuance costs	(22,900)	(6,401)
Total Amount Outstanding	1,070,564	289,115	449,610
Less Current Portion:
Term B Loan	(3,000)	(3,000)	(3,000)
Noncurrent Portion	1,067,564	286,115	446,610
Revolver [Member]
Total Debt:
Long-term Debt, Gross	0	0	160,000
Unamortized debt issuance costs	(1,714)	(1,516)
Senior Secured Notes Due 2028 And Term B Loan [Member]
Total Debt:
Unamortized debt issuance costs	(21,186)	(4,885)	(5,140)
Senior Secured Notes Due 2028 [Member]
Total Debt:
Long-term Debt, Gross	800,000	0
Unamortized debt issuance costs	(16,131)	0
Term B Loan [Member]
Total Debt:
Long-term Debt, Gross	291,750	294,000	$ 294,750
Unamortized debt issuance costs	$ (5,055)	$ (4,885)