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Other assets (Details) (CAD)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid lease payments (note 13(a)) 764 895
Intangible assets (note 13(b)) 8,625 12,866
Deferred financing costs (note 13(c)) 4,973 6,141
Total other assets, noncurrent 14,362 19,902