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Financial instruments and risk management - Maximum credit exposure (Details) (CAD) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unbilled revenue	56,183	86,859
Maximum exposure to credit risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Trade accounts receivables	93,451	213,051
Other receivables	7,018	1,078
Total accounts receivable	100,469	214,129
Unbilled revenue	56,183	86,859

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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- Definition

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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