Debt (Long-term debt) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Total Debt:
Long-term Debt, Gross	$ 292,500	$ 294,000	$ 420,500
Deferred Debt Issuance Costs	(7,295)	(6,401)
Total Amount Outstanding	287,131	289,115	415,105
Less Current Portion:
Term B Loan	(3,000)	(3,000)	(3,000)
Noncurrent Portion	284,131	286,115	412,105
Revolver [Member]
Total Debt:
Long-term Debt, Gross	0	0	125,000
Term Loan [Member]
Total Debt:
Long-term Debt, Gross	292,500	294,000	295,500
Deferred Debt Issuance Costs	$ (5,369)	$ (4,885)	$ (5,395)