Debt (Long-term debt) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Total Debt:
Long-term Debt, Gross	$ 293,250	$ 294,000	$ 336,250
Deferred Debt Issuance Costs	(6,009)	(6,401)
Total Amount Outstanding	288,621	289,115	330,600
Less Current Portion:
Term B Loan	(3,000)	(3,000)	(3,000)
Noncurrent Portion	285,621	286,115	327,600
Revolver [Member]
Total Debt:
Long-term Debt, Gross		0	40,000
Term Loan [Member]
Total Debt:
Long-term Debt, Gross	293,250	294,000	296,250
Deferred Debt Issuance Costs	$ (4,629)	$ (4,885)	$ (5,650)