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Accounts Payable And Accrued Liabilities (Schedule Of Long-Term Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Jun. 30, 2012
Accounts Payable and Accrued Liabilities [Abstract]    
Amounts payable in respect of restructuring and other Special charges (note 16) $ 3,538 $ 1,803
Other accrued liabilities 10,554 8,819
Asset retirement obligations 5,017 3,625
Accrued liabilities $ 19,109 $ 14,247