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Earnings Per Share (Tables)
 6 Months Ended
Oct. 31, 2012
Earnings Per Share [Abstract]  
Basic and diluted earnings per share
The following table presents information concerning basic and diluted earnings per share:
 
Three Months Ended
 
Six Months Ended
 
October 31,
 
October 31,
(Dollars in millions, except per share amounts)
2011
 
2012
 
2011
 
2012
Net income
$
157.6

 
$
173.0

 
$
275.6

 
$
320.5

Income allocated to participating securities
(0.1
)
 
(0.1
)
 
(0.1
)
 
(0.1
)
Net income available to common stockholders
$
157.5

 
$
172.9

 
$
275.5

 
$
320.4

 
 
 
 
 
 
 
 
Share data (in thousands):
 
 
 
 
 
 
 
Basic average common shares outstanding
214,813

 
213,276

 
215,868

 
213,220

Dilutive effect of stock-based awards
1,463

 
1,615

 
1,511

 
1,623

Diluted average common shares outstanding
216,276

 
214,891

 
217,379

 
214,843

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.73

 
$
0.81

 
$
1.28

 
$
1.50

Diluted earnings per share
$
0.73

 
$
0.80

 
$
1.27

 
$
1.49