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Accounts Payable and Accrued Liabilities - Schedule of Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable—trade $ 34,080 $ 41,722
Accrued salaries and commissions 112,593 118,024
Accrued liabilities 111,473 108,903
Accrued interest on Senior Notes 26,021 24,786
Amounts payable in respect of restructuring and other Special charges 9,810 5,622
Asset retirement obligations 1,772 3,097
Total $ 295,749 $ 302,154