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Accounts Payable and Accrued Liabilities - Schedule of Long-Term Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 5,435 $ 4,362
Other accrued liabilities 31,346 35,874
Asset retirement obligations 13,933 12,591
Total $ 50,714 $ 52,827