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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2021
Stock-Based Compensation [Abstract]  
Stock Option Plans
A summary of the activity and status of our stock option plans follows:

  
2021
    
2020
    
2019
  
   
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
    
286
    
$
50.14
                  
372
    
$
49.70
      
611
    
$
48.88
  
Granted
    
—
    
$
—
                  
—
    
$
—
      
—
    
$
—
  
Exercised
    
(60
)
  
$
43.91
                  
(34
)
  
$
38.32
      
(229
)
  
$
47.21
  
Expired or forfeited
    
(85
)
  
$
52.78
                  
(52
)
  
$
54.57
      
(10
)
  
$
56.97
  
Outstanding at end of year
    
141
    
$
51.17
      
2.6
    
$
0.9
      
286
    
$
50.14
      
372
    
$
49.70
  
Exercisable at end of year
    
141
    
$
51.17
      
2.6
    
$
0.9
      
286
    
$
50.14
      
372
    
$
49.70
  
Vested and expected to vest in the future at April 30
    
141
    
$
51.17
      
2.6
    
$
0.9
      
286
    
$
50.14
      
372
    
$
49.70
  
Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at April 30, 2021:

  
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
  
34
  
2.0
  
$
39.53
  
34
  
$
39.53
$48.06 to $49.55
  
32
  
1.1
  
$
48.22
  
32
  
$
48.22
$55.99 to $59.70
  
75
  
3.6
  
$
57.76
  
75
  
$
57.76
Total/average
  
141
  
2.6
  
$
51.17
  
141
  
$
51.17
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):

  
2021
    
2020
    
2019
  
   
Restricted
Shares
    
Weighted
Average
Grant Date
Value
    
Restricted
Shares
    
Restricted
Shares
  
 
Nonvested shares at beginning of year
    
943
    
$
49.74
      
756
      
861
  
Granted
    
706
    
$
41.49
      
759
      
415
  
Change in shares due to performance
    
118
    
$
49.84
      
(70
)
    
(19
)
Vested and issued
    
(362
)
  
$
48.48
      
(329
)
    
(357
)
Forfeited
    
(125
)
  
$
47.88
      
(173
)
    
(144
)
Nonvested shares at end of year
    
1,280
    
$
45.73
      
943
      
756