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Stock-based compensation - Textuals (Details) (CAD)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2013
Share option plan
Mar. 31, 2012
Share option plan
Mar. 31, 2011
Share option plan
Mar. 31, 2013
Share option plan
Stock options
Mar. 31, 2012
Share option plan
Stock options
Sep. 22, 2010
Senior executive stock option plan
Mar. 31, 2013
Deferred performance share unit plan
Deferred performance share units (DPSUs)
Mar. 31, 2012
Deferred performance share unit plan
Deferred performance share units (DPSUs)
Apr. 02, 2011
Deferred performance share unit plan
Deferred performance share units (DPSUs)
April 1, 2009
Apr. 02, 2011
Deferred performance share unit plan
Deferred performance share units (DPSUs)
March 31, 2010
Mar. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Mar. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Apr. 30, 2013
Restricted share unit plan
Restricted share units (RSUs)
Subsequent event
Mar. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Accrued liabilities
Mar. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Accrued liabilities
Mar. 31, 2013
Restricted share unit plan
Restricted share units (RSUs)
Other long-term liabilities
Mar. 31, 2012
Restricted share unit plan
Restricted share units (RSUs)
Other long-term liabilities
Mar. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Mar. 31, 2012
Directors' deferred share unit plan
Deferred stock units (DSUs)
Mar. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Accrued liabilities
Mar. 31, 2012
Directors' deferred share unit plan
Deferred stock units (DSUs)
Accrued liabilities
Mar. 31, 2013
Directors' deferred share unit plan
Deferred stock units (DSUs)
Other long-term liabilities
Mar. 31, 2012
Directors' deferred share unit plan
Deferred stock units (DSUs)
Other long-term liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Number shares acquired per each option exercised       1                                            
Years from grant date stock options expire             10 years                                      
Stock options annual vesting percentage       20.00%                                            
Proceeds from stock options exercised 0 35,000 963,000 0 35,000 963,000                                        
Total intrinsic value of options exercised       0 48,000 1,084,000                                        
Options outstanding, weighted average remaining life       7 years 1 month 6 days 6 years 3 months 18 days                                          
Fair value of options vested during the year       1,381,000 1,652,000                                          
Number of options exercisable       1,122,362 1,031,774                                          
Options exercisable, weighted average exercise price       8.82 8.82                                          
Total compensation costs related to non-vested awards not yet recognized       2,768,000 2,655,000                                          
Total compensation costs related to non-vested awards not yet recognized, weighted average recognition period             3 years 7 months 6 days 3 years 2 months 12 days           1 year 7 months 6 days 1 year 4 months 24 days                      
Stock options reclassified from equity to a long-term liability                 550,000                                  
Compensation cost related to the senior executive stock option plan transferred from additional paid-in capital to the senior executive stock option liability                 2,237,000                                  
Service period of award subsequent to year of grant                   2 years       2 years                        
Award vesting period                   3 years       3 years                        
Number of trading days used to determine weighted average trading price of common shares                   5 days       5 days             5 days          
Converted to (units)                     391,402 262,737 128,665                          
RSU conversion factor                       50.00% 75.00%                          
Current portion of award obligation                           719,000 2,066,000   719,000 2,066,000     355,000 0 355,000 0    
Non-current portion of award obligation                                     2,049,000 1,104,000         2,751,000 2,284,000
Award units settled during the period (units)                           345,679 27,850           63,413 0        
Award units settled during the period                           1,677,000 318,000           175,000          
Award units fully vested but unsettled                           154,330                        
Award unit redemption value (CAD per share)                               4.66                    
Weighted average remaining contractual life of award                           1 year 4 months 24 days 1 year 4 months 24 days                      
Fair market value (CAD per share)                           4.65             4.65 4.91        
Total unrecognized compensation costs related to non-vested share-based payment arrangements                           2,335,000 2,576,000                      
Percentage of non-officer directors' fixed remuneration in the form of DDSUs (50% or more)                                         50.00%