OTHER FINANCIAL STATEMENT DATA - Supplementary Cash Flow Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cash paid (received) for:
Interest	$ 7,293	$ 7,660	$ 12,336
Income taxes, net	2,314	2,237	(1,371)
Noncash investing activities:
Unpaid capital expenditures	$ 2,774	$ 6,627	$ 5,034