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Inventories (Details) (CAD) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Spare tires | 5,751 | 6,620
Job materials | 0 | 2,188
Manufacturing raw materials | 0 | 1,669
Finished goods | 0 | 1,378
Total inventories | 5,751 | 11,855

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