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Share-Based Compensation (Tables)
9 Months Ended
Jan. 31, 2015
Share-Based Compensation [Abstract]  
Schedule of share-based compensation data for awards granted
The following table provides share-based compensation data for awards granted by the Company:
 
   
For the Nine Months
Ended January 31,
 
  
2015
  
2014
 
Restricted Stock:
    
Awards granted (in thousands)
  
306
   
375
 
Weighted average fair value of grant
 
$
59.63
  
$
40.75
 
         
Stock Options:
        
Awards granted (in thousands)
  
188
   
322
 
Weighted average fair value of grant
 
$
16.97
  
$
10.12
 
Weighted-average black-scholes fair value assumptions by stock option grants
The weighted average Black-Scholes fair value assumptions for stock option grants are as follows:
 
   
For the Nine Months
Ended January 31,
 
  
2015
  
2014
 
Expected life of options (years)
  
7.2
   
7.4
 
Risk-free interest rate
  
2.2
%
  
2.1
%
Expected volatility
  
30.9
%
  
30.5
%
Expected dividend yield
  
1.9
%
  
2.5
%
Fair value of common stock on grant date
 
$
59.70
  
$
39.53