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Stock-Based Compensation (Tables)
 6 Months Ended
Oct. 31, 2021
Stock-Based Compensation [Abstract]  
Awards Granted to Employees
The following table summarizes awards we granted to employees (shares in thousands):
  
Six Months Ended
October 31,
  
   
2021
    
2020
  
Restricted Stock:
            
Awards granted (shares)
    
455
      
390
  
Weighted average fair value of grant
  
$
57.16
    
$
38.38
  
Significant Assumptions Used in Fair Value Determination
The following table provides the estimated weighted average fair value for options granted during the six months ended October 31, 2021 using the Black-Scholes option-pricing model, and the significant weighted average assumptions used in their determination.

  
Six Months Ended
October 31, 2021
  
Weighted average fair value of options on grant date
  
$
11.71
  
         
Weighted average assumptions:
        
Expected life of options (years)
    
6.3
  
Risk-free interest rate
    
1.1
%
Expected volatility
    
30.7
%
Expected dividend yield
    
2.4
%
Fair value of common stock on grant date
  
$
56.79
  
Exercise price of stock option grant
  
$
62.36