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Other long term obligations (Details) (CAD)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Other Liabilities, Noncurrent [Abstract]      
Liabilities related to equipment leases 104,000 3,169,000  
Deferred lease inducements (note 18(b)) 440,000 547,000  
Asset retirement obligation (note 18(c)) 477,000 434,000 395,000
Other obligations, current and noncurrent 7,820,000 10,926,000  
Less current portion of:      
Other obligations, noncurrent portion 6,746,000 8,860,000  
Lease Incentive, Payable [Roll Forward]      
Balance, beginning of year 547,000 654,000  
Amortization of deferred lease inducements (107,000) (107,000)  
Balance, end of year 440,000 547,000 654,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Balance, beginning of year 434,000 395,000  
Accretion expense 43,000 39,000 35,000
Balance, end of year 477,000 434,000 395,000
Estimated undiscounted cash flows required to settle obligation 1,084,000 1,084,000  
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation 9.42%    
Stock options | Senior executive stock option plan
      
Other Liabilities, Noncurrent [Abstract]      
Deferred compensation plans 925,000 1,322,000  
Restricted share units (RSUs) | Restricted share unit plan
      
Other Liabilities, Noncurrent [Abstract]      
Deferred compensation plans 2,768,000 3,170,000  
Less current portion of:      
Deferred compensation plans, current (719,000) (2,066,000)  
Deferred stock units (DSUs) | Directors' deferred share unit plan
      
Other Liabilities, Noncurrent [Abstract]      
Deferred compensation plans 3,106,000 2,284,000  
Less current portion of:      
Deferred compensation plans, current (355,000) 0