INCOME TAXES - Changes in Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 41,941	$ 34,912
Balance at end of year	37,453	41,941
Additions charged to income tax expense
Valuation Allowance [Roll Forward]
Change in valuation allowance	5,601	7,391
Reductions credited to income tax expense
Valuation Allowance [Roll Forward]
Change in valuation allowance	(11,520)	35
Currency translation adjustments
Valuation Allowance [Roll Forward]
Change in valuation allowance	$ 1,431	$ (397)