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Accounting Policies (Tables)
 12 Months Ended
Apr. 30, 2015
Accounting Policies [Abstract]  
Basic and diluted earnings per share
The following table presents information concerning basic and diluted earnings per share: 
 
2013
 
2014
 
2015
Net income available to common stockholders
$
591

 
$
659

 
$
684

Share data (in thousands):
 
 
 
 
 
Basic average common shares outstanding
213,369

 
213,454

 
211,593

Dilutive effect of stock-based awards
1,617

 
1,628

 
1,490

Diluted average common shares outstanding
214,986

 
215,082

 
213,083

 
 
 
 
 
 
Basic earnings per share
$
2.77

 
$
3.08

 
$
3.23

Diluted earnings per share
$
2.75

 
$
3.06

 
$
3.21