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Shares
 12 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Shares
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, 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 and 2013
 
36,251,006

 
$
304,908


b) Net (loss) income per share
Year ended March 31,
 
2013

 
2012

 
2011

Net loss from continuing operations
 
$
(28,309
)
 
$
(25,383
)
 
$
(29,726
)
Net income (loss) from discontinued operations
 
26,846

 
4,221

 
(4,924
)
Net loss
 
$
(1,463
)
 
$
(21,162
)
 
$
(34,650
)
 
 
 
 
 
 
 
Weighted average number of common shares (no dilutive effect)
 
36,251,006

 
36,249,082

 
36,119,356

 
 
 
 
 
 
 
Basic per share information (no dilutive effect)
 
 
 
 
 
 
Net loss from continuing operations
 
$
(0.78
)
 
$
(0.70
)
 
$
(0.82
)
Net income (loss) from discontinued operations
 
0.74

 
0.12

 
(0.14
)
Net loss
 
$
(0.04
)
 
$
(0.58
)
 
$
(0.96
)

For the year ended March 31, 2013, there were 2,985,722 stock options which were anti-dilutive (March 31, 2012 – 1,834,794 and 50,000 stock options and stock awards, respectively; March 31, 2011 – 1,647,474, 75,591 and 150,000 stock options, stock awards and deferred performance share units, respectively) and therefore were not considered in computing diluted earnings per share.