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Net income (loss) per common share (Notes)
 6 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Net income per common share
Net Income (Loss) Per Common Share
 
The following table sets forth the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):
 
Three Months Ended
 
Six Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Net income (loss)
$
99,806

 
$
(21,184
)
 
$
178,385

 
$
57,526

Weighted average common shares outstanding
197,825

 
194,060

 
197,388

 
193,756

Dilutive effect of stock options and RSUs
4,144

 
—

 
3,908

 
3,701

Dilutive effect of convertible debt
14,506

 
—

 
13,075

 
7,170

Weighted average common and potential common shares outstanding
216,475

 
194,060

 
214,371

 
204,627

Basic net income (loss) per common share
$
0.50

 
$
(0.11
)
 
$
0.90

 
$
0.30

Diluted net income (loss) per common share
$
0.46

 
$
(0.11
)
 
$
0.83

 
$
0.28



Diluted net income per common share for the three and six months ended September 30, 2013 includes 14,506,100 shares and 13,075,168 shares, respectively, issuable upon the exchange of debentures (see Note 14).  Diluted net income per common share for the six months ended September 30, 2012 includes 7,169,730 shares issuable upon the exchange of debentures.  The debentures have no impact on diluted net income per common share unless the average price of the Company's common stock exceeds the conversion price because the principal amount of the debentures will be settled in cash upon conversion.  Prior to conversion, the Company will include, in the diluted net income per common share calculation, the effect of the additional shares that may be issued when the Company's common stock price exceeds the conversion price using the treasury stock method.  The weighted average conversion price per share used in calculating the dilutive effect of the convertible debt for the three and six-month periods ended September 30, 2013 was $26.42 and $26.54, respectively. The weighted average conversion price per share used in calculating the dilutive effect of the convertible debt for the six-month period ended September 30, 2012 was $27.65.

Weighted average common shares exclude the effect of option shares which are not dilutive.  There were no antidilutive option shares for the three and six months ended September 30, 2013. For the three and six months ended September 30, 2012, the number of option shares that were antidilutive was 3,367,634 and 110,021, respectively.