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Shares
 12 Months Ended
Mar. 31, 2012
Shares [Abstract]  
Shares

18. Shares

a) Common shares

Authorized:

Unlimited number of voting common shares

Unlimited number of non-voting common shares

Issued and outstanding:

 

                     
     Number of
Shares		         Amount  

Voting common shares

                    

Issued and outstanding at March 31, 2009

     36,038,476           $303,431  

Issued upon exercise of stock options

     10,800           53  

Transferred from additional paid-in capital on exercise of stock options

     –           21  

Issued and outstanding at March 31, 2010

     36,049,276           $303,505  

Issued upon exercise of stock options

     193,250           963  

Transferred from additional paid-in capital on exercise of stock options

     –           386  

Issued and outstanding at March 31, 2011

     36,242,526           $304,854  

Issued upon exercise of stock options

     8,480           35  

Transferred from additional paid-in capital on exercise of stock options

     –           19  

Issued and outstanding at March 31, 2012

     36,251,006           $304,908  

b) Net (loss) income per share

 

                                 
     2012         2011         2010  

Year ended March 31,

                                

Net (loss) income available to common shareholders

     $(21,122 )          $(34,709 )          $28,219  

Weighted average number of common shares

     36,249,082           36,119,356           36,040,857  

Basic net (loss) income per share

     $(0.58 )          $(0.96 )          $0.78  
           
     2012         2011         2010  

Year ended March 31,

                                

Net (loss) income available to common shareholders

     $(21,122 )          $(34,709 )          $28,219  

Weighted average number of common shares

     36,249,082           36,119,356           36,040,857  

Dilutive effect of stock options, deferred performance share units and stock award plan

     –           –           680,169  

Weighted average number of diluted common shares

     36,249,082           36,119,356           36,721,026  

Diluted net (loss) income per share

     $(0.58 )          $(0.96 )          $0.77  

For the year ended March 31, 2012, there were 1,834,794 and 50,000 stock options and stock awards, respectively, which were anti-dilutive (March 31, 2011 – 1,647,474, 75,591 and 150,000 stock options, deferred performance share units and stock awards, respectively; March 31, 2010 – 820,641 and 57,311 stock options and deferred performance share units, respectively) and therefore were not considered in computing diluted earnings per share.