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Accounts receivable (Details) (CAD)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Receivables [Abstract]        
Accounts receivable – trade 66,823,000 180,917,000    
Accounts receivable – holdbacks 26,628,000 32,134,000    
Income and other taxes receivable 3,375,000 0    
Accounts receivable – other 3,643,000 1,288,000    
Allowance for doubtful accounts (note 17(d)) 0 (210,000) (30,000) (1,691,000)
Total accounts receivable 100,469,000 214,129,000    
Accounts receivable – holdback percentage 10.00%      
Accounts receivable – holdbacks, noncurrent 0 6,038,000