OTHER FINANCIAL STATEMENT DATA - Supplementary Cash Flow Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Cash paid (received) for:
Interest	$ 11,940	$ 7,390	$ 4,408
Taxes and penalties, net	(2,636)	2,150	2,096
Non-cash investing activities:
Unpaid capital expenditures	$ 312	$ 2,569	$ 3,873