DEBT (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Long-term debt disclosure
Principal	$ 305,000	$ 220,000
Debt Issuance Costs	(4,561)	(5,446)
Total debt	300,439	214,554
Credit Facility
Long-term debt disclosure
Principal	305,000	220,000
Debt Issuance Costs	(4,561)	(5,446)
Total debt	300,439	214,554
Outstanding amount under credit facility	305,000
Available under the revolving credit facility	$ 695,000
Effective interest rate (as percent)	1.29%
Interest expense recognized	$ 7,000	$ 1,700	$ 5,700
LIBOR | Credit Facility
Long-term debt disclosure
Basis spread on interest rate (as a percent)	1.10%