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Other assets (Details) (CAD) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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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

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