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Net (loss) income per common share (Tables)
 6 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted net (loss) income per common share (in thousands, except per share amounts):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
Net (loss) income
$
(21,184
)
 
$
79,287

 
$
57,526

 
$
178,580

Weighted average common shares outstanding
194,060

 
190,809

 
193,756

 
190,461

Dilutive effect of stock options and RSUs
—

 
4,107

 
3,701

 
4,332

Dilutive effect of convertible debt
—

 
5,283

 
7,170

 
7,590

Weighted average common and potential common shares outstanding
194,060

 
200,199

 
204,627

 
202,383

Basic net (loss) income per common share
$
(0.11
)
 
$
0.42

 
$
0.30

 
$
0.94

Diluted net (loss) income per common share
$
(0.11
)
 
$
0.40

 
$
0.28

 
$
0.88