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Accounts Payable And Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Accounts Payable and Accrued Liabilities [Abstract]    
Present value of asset retirement obligation $ 8.7otex_AssetRetirementObligationPresentValue $ 9.8otex_AssetRetirementObligationPresentValue
Undiscounted value of asset retirement obligation $ 9.2otex_AssetRetirementObligationUndiscountedValue $ 10.4otex_AssetRetirementObligationUndiscountedValue