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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] The following table presents information about SSARs outstanding as of April 30, 2020, and for the year then ended.
 
Number of
SSARs
(in thousands)
 
Weighted-
Average
Exercise Price
per SSAR
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Intrinsic Value
Outstanding at April 30, 2019
6,852

 
$
33.25

 
 
 
 
Granted
522

 
54.64

 
 
 
 
Exercised
(2,434
)
 
27.77

 
 
 
 
Forfeited or expired
(10
)
 
49.70

 
 
 
 
Outstanding at April 30, 2020
4,930

 
$
38.19

 
5.1
 
$
118

Exercisable at April 30, 2020
2,932

 
$
31.86

 
3.7
 
$
89
Schedule of Share-Based Payment Award, Stock Appreciation Rights, Valuation Assumptions [Table Text Block] The weighted-average grant-date fair values and related valuation assumptions for the SSARS granted during each of the last three years were as follows:
 
2018
 
2019
 
2020
Grant-date fair value
$
6.79

 
$
11.06

 
$
11.13

Valuation assumptions:
 
 
 
 
 
Expected term (years)
7.00

 
7.00

 
7.00

Risk-free interest rate
2.2
%
 
2.9
%
 
1.9
%
Expected volatility
15.6
%
 
17.1
%
 
19.3
%
Expected dividend yield
1.5
%
 
1.4
%
 
1.2
%
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
The following table presents information about RSUs outstanding as of April 30, 2020, and for the year then ended.
 
Number of
RSUs
(in thousands)
 
Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2019
382

 
$
44.91

Granted
88

 
$
56.99

Converted to common shares
(179
)
 
$
38.56

Forfeited
(2
)
 
$
55.27

Outstanding at April 30, 2020
289

 
$
52.44
Schedule of Share-Based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block] The weighted average grant-date fair values and related valuation assumptions for these awards granted during each of the last three years were as follows:
 
2018
 
2019
 
2020
Grant-date fair value
$
46.93

 
$
55.29

 
$
56.99

Valuation assumptions:
 
 
 
 
 
Risk-free interest rate
1.5
%
 
2.7
%
 
1.8
%
Expected volatility
18.9
%
 
20.8
%
 
21.8
%
Expected dividend yield
1.4
%
 
1.2
%
 
1.2
%
Remaining performance period (years) as of grant date
2.8

 
2.8

 
2.8
Grant Date Fair Values of DSUs [Table Text Block] The weighted average grant-date fair values for these awards granted during each of the last three years were as follows:
 
2018
 
2019
 
2020
Grant-date fair value
$
41.81

 
$
54.20

 
$
53.34
Share-based Payment Arrangement, Cost by Plan [Table Text Block] The pre-tax stock-based compensation expense and related deferred income tax benefits recognized during the last three fiscal years were as follows:
 
2018
 
2019
 
2020
Pre-tax compensation expense
$
19

 
$
14

 
$
11

Deferred tax benefit
6

 
2

 
2
Stock-Based Awards, Other Information [Table Text Block] Further information related to our stock-based awards for the last three years is as follows:
 
2018
 
2019
 
2020
Intrinsic value of SSARs exercised
$
73

 
$
31

 
$
89

Fair value of shares vested1
6

 
20

 
14

Excess tax benefit from exercise / vesting of awards
18

 
7

 
20