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Stock-Based Compensation (Tables)
3 Months Ended
Jul. 31, 2021
Stock-Based Compensation [Abstract]  
Awards Granted to Employees
The following table summarizes awards we granted to employees (shares in thousands):
 
Three Months Ended
July 31,
 
   
2021
   
2020
 
Restricted Stock:
           
Awards granted (shares)
   
433
     
358
 
Weighted average fair value of grant
 
$
57.36
   
$
38.88
 
Significant Assumptions Used in Fair Value Determination

Expected life of options (years)
   
6.3
 
Risk-free interest rate
   
1.1
%
Expected volatility
   
30.6
%
Expected dividend yield
   
2.4
%
Fair value of common stock on grant date
 
$
57.34
 
Exercise price of stock option grant
 
$
63.07