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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other special charges $ 4,359 $ 13,768
Other accrued liabilities 10,681 8,215
Asset retirement obligations 13,790 12,972
Total $ 28,830 $ 34,955