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Costs incurred and estimated earnings net of billings on uncompleted contracts (Details) (CAD)	Mar. 31, 2013	Mar. 31, 2012
Costs in excess of billings [Abstract]
Costs incurred and estimated earnings on uncompleted contracts	512,339,000	587,220,000
Less billings to date	(463,241,000)	(509,511,000)
Costs in excess of billings on uncompleted contracts	49,098,000	77,709,000
Contracts receivable [Abstract]
Unbilled revenue	56,183,000	86,859,000
Billings in excess of costs incurred and estimated earnings on uncompleted contracts	(7,085,000)	(7,514,000)
Unbilled contracts receivable	49,098,000	79,345,000
Unbilled revenue related to non-custruction activities	0	1,636,000
Long-term unbilled revenue	16,139,000	18,302,000

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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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Total amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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