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Interest expense (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Schedule of Interest Expense [Line Items]      
Amortization of deferred financing costs 1,607 1,591 1,609
Interest on long term debt 23,176 21,818 21,571
Other interest 567 328 962
Total interest expense, net 23,743 22,146 22,533
Senior notes and swaps | 8.75% senior notes
      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 0 0 1,238
Capital lease obligations
      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 1,925 425 643
Credit facilities
      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 4,414 4,547 2,992
Corporate debentures | Series 1 Debentures
      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 15,230 15,255 15,089