DEBT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Apr. 03, 2020	Jun. 30, 2019
Long-term debt disclosure
Principal	$ 105,000		$ 105,000			$ 220,000
Debt Issuance Costs	(4,846)		(4,846)			(5,446)
Total debt	100,154		100,154			214,554
Interest expense recognized		$ 300		$ 900
Repayment of debt			115,000
Credit Facility
Long-term debt disclosure
Principal	105,000		105,000			220,000
Debt Issuance Costs	(4,846)		(4,846)			(5,446)
Total debt	100,154		100,154			$ 214,554
Outstanding amount under credit facility	105,000		105,000		$ 305,000
Available under the revolving credit facility	$ 895,000		$ 895,000		$ 695,000
Effective interest rate (as percent)	1.87%		1.87%		2.54%
Interest expense recognized	$ 1,200		$ 5,000
Principal amount of debt issued					$ 200,000
LIBOR | Credit Facility
Long-term debt disclosure
Basis spread on interest rate (as a percent)			1.10%
Interest rate on convertible senior notes (as a percent)					1.10%