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Other assets - Intangible assets (Details) (CAD)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Cost 22,264,000 25,648,000  
Accumulated Amortization 13,639,000 12,782,000  
Net Book Value 8,625,000 12,866,000  
Internally developed computer software capitalized during the period 5,081,000 3,537,000 4,748,000
Amortization of intangible assets 3,694,000 4,287,000 2,150,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2014 3,430,000    
2015 2,612,000    
2016 1,801,000    
2017 782,000    
2018 and thereafter 0    
Net Book Value 8,625,000 12,866,000  
Customer relationships and backlog
      
Finite-Lived Intangible Assets [Line Items]      
Cost   4,442,000  
Accumulated Amortization   1,445,000  
Net Book Value   2,997,000  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Net Book Value   2,997,000  
Other intangible assets
      
Finite-Lived Intangible Assets [Line Items]      
Cost 350,000 2,364,000  
Accumulated Amortization 328,000 1,204,000  
Net Book Value 22,000 1,160,000  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Net Book Value 22,000 1,160,000  
Internal-use software
      
Finite-Lived Intangible Assets [Line Items]      
Cost 21,914,000 16,825,000  
Accumulated Amortization 13,311,000 9,644,000  
Net Book Value 8,603,000 7,181,000  
Impairment of intangible assets 0 249,000 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Net Book Value 8,603,000 7,181,000  
Patents
      
Finite-Lived Intangible Assets [Line Items]      
Cost   2,017,000  
Accumulated Amortization   489,000  
Net Book Value   1,528,000  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Net Book Value   1,528,000