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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2023
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, 2023, 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, 2022
4,232 $47.54 
Granted387 73.61 
Exercised(579)34.58 
Forfeited or expired(30)70.63 
Outstanding at April 30, 2023
4,010 $51.76 4.8$60 
Exercisable at April 30, 2023
2,758 $43.23 3.5$60 
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:
202120222023
Grant-date fair value$14.61 $16.61 $20.67 
Valuation assumptions:
Expected term (years)7.07.07.0
Risk-free interest rate0.4 %1.0 %2.7 %
Expected volatility23.3 %24.1 %24.8 %
Expected dividend yield1.0 %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, 2023, and for the year then ended.
Number of
PBRSUs
(in thousands)		Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2022270 $67.02 
Granted110 $84.75 
Adjusted for performance and dividends(14)$56.98 
Converted to common shares(70)$56.98 
Forfeited(7)$82.42 
Outstanding at April 30, 2023289 $76.33 
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:
202120222023
Grant-date fair value$73.68 $70.11 $84.75 
Valuation assumptions:
Risk-free interest rate0.1 %0.3 %2.8 %
Expected volatility29.9 %29.1 %29.8 %
Expected dividend yield1.1 %1.0 %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:
202120222023
Grant-date fair value$63.01 $67.35 $72.10 
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:
202120222023
Pre-tax compensation expense$12 $15 $18 
Deferred tax benefit2 2 3 
Stock-Based Awards, Other Information [Table Text Block] Further information related to our stock-based awards for the last three years is as follows:
202120222023
Intrinsic value of SSARs exercised$47 $23 $19 
Fair value of shares vested13 7 6 
Excess tax benefit from exercise / vesting of awards10 6 4