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Financial instruments and risk management - Financial instruments (Details) (CAD)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Carrying Amount
    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations 41,822,000 [1] 10,701,000 [1]
Series 1 Debentures 225,000,000 [2] 225,000,000 [2]
Fair Value
    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations 37,369,000 [1] 10,657,000 [1]
Series 1 Debentures 220,079,000 [2] 203,624,000 [2]
Credit facilities
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Outstanding balance, long-term debt 45,200,000 78,800,000
Change in annual interest expense as a result of 100 basis point change to interest rates 500,000  
[1] The fair values of amounts due under capital leases are based on management estimates which are determined by discounting cash flows required under the instruments at the interest rates currently estimated to be available for instruments with similar terms.
[2] The fair value of the Series 1 Debentures is based upon the expected discounted cash flows and the period end market price of similar financial instruments.