ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Foreign Currency (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	$ (4,184)	$ (4,330)	$ 4,845
Other Income (Expense)
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	$ (4,200)	$ (4,300)	$ 4,800