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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Jun. 30, 2015
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges $ 4,310 $ 2,034
Other accrued liabilities 20,228 24,826
Asset retirement obligations 6,819 7,822
Accrued liabilities $ 31,357 $ 34,682