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Accrued liabilities (Details) (CAD)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Payables and Accruals [Abstract]    
Accrued interest payable 9,863 9,866
Payroll liabilities 19,040 15,228
Liabilities related to equipment leases 687 4,238
Income and other taxes payable 2,892 7,463
Accrued liabilities 32,482 36,795