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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other special charges $ 3,757 $ 4,359
Other accrued liabilities 10,617 10,681
Asset retirement obligations 12,502 13,790
Total $ 26,876 $ 28,830