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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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