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Other assets - Deferred financing costs (Details) (CAD)	12 Months Ended													0 Months Ended			1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2013 Interest expense	Mar. 31, 2012 Interest expense	Mar. 31, 2011 Interest expense	Mar. 31, 2013 Term and Revolving Facilities Credit facilities	Mar. 31, 2012 Term and Revolving Facilities Credit facilities	Mar. 31, 2011 Term and Revolving Facilities Credit facilities	Mar. 31, 2013 Series 1 Debentures Corporate debentures	Mar. 31, 2012 Series 1 Debentures Corporate debentures	Mar. 31, 2011 Series 1 Debentures Corporate debentures	Apr. 07, 2010 Series 1 Debentures Corporate debentures	Apr. 28, 2010 8.75% senior notes Senior notes	Mar. 31, 2013 8.75% senior notes Senior notes	Nov. 26, 2003 8.75% senior notes Senior notes	Apr. 25, 2010 8.75% senior notes Senior notes Interest expense
Deferred financing costs [Abstract]
Cost	12,747,000	12,308,000					5,861,000	5,422,000		6,886,000	6,886,000
Accumulated Amortization	7,774,000	6,167,000					5,384,000	4,652,000		2,390,000	1,515,000
Net Book Value	4,973,000	6,141,000					477,000	770,000		4,496,000	5,371,000
Financing fees incurred in connection with debt modification							439,000	60,000	1,034,000
Financing fees incurred in connection with debt issuance										0	0	5,846,000
Amortization of deferred financing costs	1,607,000	1,591,000	1,609,000	1,607,000	1,591,000	1,609,000											183,000
Stated interest rate on long term debt													9.125%		8.75%	8.75%
Unamortized deferred financing costs expensed upon redemption of notes														4,324,000

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Debt Modification Costs

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For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Interest rate stated in the contractual debt agreement.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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