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Loss Per Share and Stockholders' Equity
 3 Months Ended
Jul. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
PER SHARE AND STOCKHOLDERS' EQUITY
Basic and diluted loss per share is computed using the two-class method. The two-class method is an earnings allocation formula that determines net income per share for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. Per share amounts are computed by dividing net income from continuing operations attributable to common shareholders by the weighted average shares outstanding during each period. The dilutive effect of potential common shares is included in diluted earnings per share except in those periods with a loss from continuing operations. Diluted earnings per share excludes the impact of shares of common stock issuable upon the lapse of certain restrictions or the exercise of options to purchase 6.3 million shares and 9.2 million shares for the three months ended July 31, 2013 and 2012, respectively, as the effect would be antidilutive due to the net loss from continuing operations during those periods.
The computations of basic and diluted earnings per share from continuing operations are as follows:
(in 000s, except per share amounts)
 
Three months ended July 31,
 
2013

 
2012

Net loss from continuing operations attributable to shareholders
 
$
(113,270
)
 
$
(105,650
)
Net loss allocated to participating securities
 
(62
)
 
(73
)
Net loss from continuing operations attributable to common shareholders
 
$
(113,332
)
 
$
(105,723
)
 
 
 
 
 
Basic weighted average common shares
 
273,080

 
277,155

Potential dilutive shares
 
—

 
—

Dilutive weighted average common shares
 
273,080

 
277,155

 
 
 
 
 
Loss per share from continuing operations attributable to common shareholders:
 
 
 
 
Basic
 
$
(0.42
)
 
$
(0.38
)
Diluted
 
(0.42
)
 
(0.38
)

The weighted average shares outstanding for the three months ended July 31, 2013 decreased to 273.1 million from 277.2 million for the three months ended July 31, 2012, primarily due to share repurchases completed during fiscal year 2013. During the three months ended July 31, 2012, we purchased and immediately retired 21.3 million shares of our common stock at a cost of $315.0 million.
During the three months ended July 31, 2013, we acquired 0.2 million shares of our common stock at an aggregate cost of $4.2 million. These shares represent shares swapped or surrendered to us in connection with the vesting or exercise of stock-based awards. During the three months ended July 31, 2012, we acquired 0.1 million shares at an aggregate cost of $1.6 million for similar purposes.
During the three months ended July 31, 2013 and 2012, we issued 1.4 million and 0.3 million shares of common stock, respectively, due to the vesting or exercise of stock-based awards.
During the three months ended July 31, 2013, we granted 0.8 million nonvested units under our stock-based compensation plans. Nonvested units granted generally either vest over a three year period with one-third vesting each year or cliff vest at the end of a three-year period. Stock-based compensation expense of our continuing operations totaled $4.6 million and $2.4 million for the three months ended July 31, 2013 and 2012, respectively. As of July 31, 2013, unrecognized compensation cost for options totaled $2.7 million, and for nonvested shares and units totaled $39.2 million.