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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2022
Stock-Based Compensation [Abstract]  
Significant Assumptions Used in Fair Value Determination
The following table provides the estimated weighted average fair value for options granted during the year ended April 30, 2022 using the Black-Scholes option-pricing model, and the significant weighted average assumptions used in their determination.

Weighted average fair value of options on grant date
  
$
11.75
  
         
Weighted average assumptions:
        
Expected life of options (years)
    
6.3
  
Risk-free interest rate
    
1.2
%
Expected volatility
    
30.7
%
Expected dividend yield
    
2.4
%
Fair value of common stock on grant date
  
$
56.51
  
Exercise price of stock option grant
  
$
61.84
  
Stock Option Plans
A summary of the activity and status of our stock option plans follows:

  
2022
    
2021
    
2020
  
   
Number
of Options
(in 000’s)
    
Weighted
Average
Exercise
Price
    
Weighted
Average
Remaining
Term
(in years)
    
Aggregate
Intrinsic
Value
(in millions)
    
Number
of Options
(in 000’s)
    
Weighted
Average
Exercise
Price
    
Number
of Options
(in 000’s)
    
Weighted
Average
Exercise
Price
  
Outstanding at beginning of year
    
141
    
$
51.17
                  
286
    
$
50.14
      
372
    
$
49.70
  
Granted
    
300
    
$
61.84
                  
—
    
$
—
      
—
    
$
—
  
Exercised
    
(49
)
  
$
45.85
                  
(60
)
  
$
43.91
      
(34
)
  
$
38.32
  
Expired or forfeited
    
(82
)
  
$
60.36
                  
(85
)
  
$
52.78
      
(52
)
  
$
54.57
  
Outstanding at end of year
    
310
    
$
59.89
      
8.1
    
$
0.2
      
141
    
$
51.17
      
286
    
$
50.14
  
Exercisable at end of year
    
72
    
$
54.53
      
4.2
    
$
7.6
      
141
    
$
51.17
      
286
    
$
50.14
  
Vested and expected to vest in the future at April 30
    
306
    
$
60.55
      
9.1
    
$
—
      
141
    
$
51.17
      
286
    
$
50.14
  
Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at April 30, 2022:

  
Options Outstanding
  
Options Exercisable
Range of Exercise Prices
  
Number
of Options
(in 000’s)
  
Weighted Average
Remaining
Term
(in years)
  
Weighted
Average
Exercise
Price
  
Number
of Options
(in 000’s)
  
Weighted
Average
Exercise
Price
$39.53
  
17
  
1.2
  
$
39.53
  
17
  
$
39.53
$48.06 to $49.55
  
33
  
0.2
  
$
52.69
  
3
  
$
48.06
$55.62 to $63.07
  
260
  
5.4
  
$
62.17
  
52
  
$
59.98
Total/average
  
310
  
8.1
  
$
59.89
  
72
  
$
54.53
Activity for Performance-Based and Other Restricted Stock Awards
Activity for performance-based and other restricted stock awards during the years ended April 30, was as follows (shares in thousands):

  
2022
    
2021
    
2020
  
   
Restricted
Shares
    
Weighted
Average
Grant Date
Value
    
Restricted
Shares
    
Restricted
Shares
  
 
Nonvested shares at beginning of year
    
1,280
    
$
45.73
      
943
      
756
  
Granted
    
658
    
$
56.53
      
706
      
759
  
Change in shares due to performance
    
(3
)
  
$
30.41
      
118
      
(70
)
Vested and issued
    
(432
)
  
$
50.87
      
(362
)
    
(329
)
Forfeited
    
(229
)
  
$
48.23
      
(125
)
    
(173
)
Nonvested shares at end of year
    
1,274
    
$
49.17
      
1,280
      
943