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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other special charges $ 3,547 $ 13,768
Other accrued liabilities 11,073 8,215
Asset retirement obligations 13,714 12,972
Total $ 28,334 $ 34,955