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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2019
Stock-Based Compensation [Abstract]  
Estimated Weighted-Average Fair Value for Options Granted and Significant Weighted-Average Assumptions Used
The following table provides the estimated weighted average fair value for options granted in the year ended April 30, 2016 using the Black-Scholes option-pricing model and the significant weighted average assumptions used in their determination. The expected life represents an estimate of the period of time stock options will be outstanding based on the historical exercise behavior of option recipients. The risk-free interest rate is based on the corresponding U.S. Treasury yield curve in effect at the time of the grant. The expected volatility is based on the historical volatility of our Common Stock price over the estimated life of the option, while the dividend yield is based on the expected dividend payments to be made by us.

  
2016
 
Fair Value of Options on Grant Date
 
$
14.77
 
 
    
Weighted Average assumptions:
    
Expected Life of Options (years)
  
7.2
 
Risk-Free Interest Rate
  
2.1
%
Expected Volatility
  
29.7
%
Expected Dividend Yield
  
2.1
%
Fair Value of Common Stock on Grant Date
 
$
55.99
 
Stock Option Plans
A summary of the activity and status of our stock option plans follows:

  
2019
  
2018
  
2017
 
  
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
  
611
  
$
48.88
         
1,429
  
$
47.39
   
1,966
  
$
46.62
 
Granted
  
—
  
$
—
         
—
  
$
—
   
—
  
$
—
 
Exercised
  
(229
)
 
$
47.21
         
(788
)
 
$
45.97
   
(469
)
 
$
43.74
 
Expired or Forfeited
  
(10
)
 
$
56.97
         
(30
)
 
$
54.24
   
(68
)
 
$
49.91
 
Outstanding at End of Year
  
372
  
$
49.70
   
2.8
  
$
0.8
   
611
  
$
48.88
   
1,429
  
$
47.39
 
Exercisable at End of Year
  
372
  
$
49.70
   
2.8
  
$
0.8
   
530
  
$
47.43
   
1,064
  
$
46.04
 
Vested and Expected to Vest in the Future at April 30
  
372
  
$
49.70
   
2.8
  
$
0.8
   
599
  
$
48.90
   
1,249
  
$
45.88
 
Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at April 30, 2019:

   
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
 
$
35.04
   
11
   
0.2
  
$
35.04
   
11
  
$
35.04
 
$
39.53 to $40.02
   
101
   
2.3
  
$
39.71
   
101
  
$
39.71
 
$
48.06 to $49.55
   
106
   
2.3
  
$
48.69
   
106
  
$
48.69
 
$
55.99 to $59.70
   
154
   
3.6
  
$
57.87
   
154
  
$
57.87
 
Total/Average
   
372
   
2.8
  
$
49.70
   
372
  
$
49.70
 
Activity for Performance-Based and Other Restricted Stock Awards
Activity for performance-based and other restricted stock awards during the years ended April 30, 2019, 2018, and 2017 was as follows (shares in thousands):

  
2019
  
2018
  
2017
 
  
Restricted
Shares
  
Weighted Average
Grant Date Value
  
Restricted
Shares
  
Restricted
Shares
 
 
Nonvested Shares at Beginning of Year
  
861
  
$
53.22
   
913
   
915
 
Granted
  
415
  
$
62.63
   
525
   
509
 
Change in Shares Due to Performance
  
(19
)
 
$
44.17
   
(107
)
  
(67
)
Vested and Issued
  
(357
)
 
$
54.95
   
(318
)
  
(267
)
Forfeited
  
(144
)
 
$
55.37
   
(152
)
  
(177
)
Nonvested Shares at End of Year
  
756
  
$
57.38
   
861
   
913