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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2024
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, 2024, 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, 2023
4,010 $51.76 
Granted336 69.69 
Exercised(568)37.85 
Forfeited or expired(28)64.63 
Outstanding at April 30, 2024
3,750 $55.37 4.6$12 
Exercisable at April 30, 2024
2,617 $48.54 3.4$12 
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:
202220232024
Grant-date fair value$16.61 $20.67 $21.69 
Valuation assumptions:
Expected term (years)7.07.07.0
Risk-free interest rate1.0 %2.7 %4.1 %
Expected volatility24.1 %24.8 %25.0 %
Expected dividend yield1.0 %1.0 %1.2 %
Share-Based Payment Arrangement, PBRSU, Activity [Table Text Block]
The following table presents information about PBRSUs outstanding as of April 30, 2024, and for the year then ended.
Number of
PBRSUs
(in thousands)		Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2023
289 $76.33 
Granted209 $75.70 
Adjusted for performance and dividends(38)$73.56 
Converted to common shares(41)$73.56 
Forfeited(6)$77.12 
Outstanding at April 30, 2024
413 $76.53 
Schedule of Share-Based Payment Award, Performance Based Restricted Stock Units, Valuation Assumptions [Table Text Block] The following table shows the assumptions used in the Monte Carlo simulation model to value the awards granted during each of the last three fiscal years.
202220232024
Valuation assumptions:
Risk-free interest rate0.3 %2.8 %4.6 %
Expected volatility29.1 %29.8 %22.2 %
Expected dividend yield1.0 %1.0 %1.2 %
Remaining performance period (years) as of grant date2.82.82.8
Share-based Payment Arrangement, Performance Based Restricted Stock Units, Activity [Table Text Block] The following table presents information about RSUs outstanding as of April 30, 2024, and for the year then ended.
Number of
RSUs
(in thousands)		Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2023— $— 
Granted89 $68.89 
Additions for dividend equivalents
1 $69.41 
Forfeited(3)$69.17 
Outstanding at April 30, 202487 $68.88 
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:
202220232024
Grant-date fair value$67.35 $72.10 $71.23 
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:
202220232024
Pre-tax compensation expense$15 $18 $25 
Deferred tax benefit2 3 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:
202220232024
Intrinsic value of SSARs exercised$23 $19 $12 
Fair value of shares vested7 6 4 
Excess tax benefit from exercise / vesting of awards6 4 2