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ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Foreign Currency (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Other Income (Expense)      
Intercompany Foreign Currency Balance [Line Items]      
Foreign exchange gains (losses) $ (1,273) $ (4,184) $ (4,330)