OTHER FINANCIAL STATEMENT DATA - Supplementary Cash Flow Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Cash paid (received) for:
Interest	$ 4,408	$ 7,022	$ 7,293
Taxes and penalties, net	2,096	2,397	2,314
Noncash investing activities:
Unpaid capital expenditures	$ 3,873	$ 9,209	$ 2,774