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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2022
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, 2022, 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, 2021
4,311 $43.54 
Granted451 71.24 
Exercised(565)29.67 
Forfeited or expired(29)63.82 
Other64 
Outstanding at April 30, 2022
4,232 $47.54 4.9$86 
Exercisable at April 30, 2022
2,829 $39.55 3.5$79 
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:
202020212022
Grant-date fair value$11.13 $14.61 $16.61 
Valuation assumptions:
Expected term (years)7.07.07.0
Risk-free interest rate1.9 %0.4 %1.0 %
Expected volatility19.3 %23.3 %24.1 %
Expected dividend yield1.2 %1.0 %1.0 %
Share-based Payment Arrangement, Performance Based Restricted Stock Units, Activity [Table Text Block]
The following table presents information about PBRSUs outstanding as of April 30, 2022, and for the year then ended.
Number of
PBRSUs
(in thousands)		Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2021254 $61.76 
Granted108 $70.11 
Adjusted for performance and dividends(10)$55.28 
Converted to common shares(77)$55.28 
Forfeited(5)$69.19 
Outstanding at April 30, 2022270 $67.02 
Schedule of Share-Based Payment Award, Performance Based 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:
202020212022
Grant-date fair value$56.99 $73.68 $70.11 
Valuation assumptions:
Risk-free interest rate1.8 %0.1 %0.3 %
Expected volatility21.8 %29.9 %29.1 %
Expected dividend yield1.2 %1.1 %1.0 %
Remaining performance period (years) as of grant date2.82.82.8
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:
202020212022
Grant-date fair value$53.34 $63.01 $67.35 
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:
202020212022
Pre-tax compensation expense$11 $12 $15 
Deferred tax benefit2 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:
202020212022
Intrinsic value of SSARs exercised$89 $47 $23 
Fair value of shares vested14 13 7 
Excess tax benefit from exercise / vesting of awards20 10 6