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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2021
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, 2021, 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, 2020
4,930 $38.19 
Granted448 69.21 
Exercised(1,064)29.53 
Forfeited or expired(3)53.40 
Outstanding at April 30, 2021
4,311 $43.54 5.1$141 
Exercisable at April 30, 2021
2,805 $35.38 3.7$115 
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:
201920202021
Grant-date fair value$11.06 $11.13 $14.61 
Valuation assumptions:
Expected term (years)7.07.07.0
Risk-free interest rate2.9 %1.9 %0.4 %
Expected volatility17.1 %19.3 %23.3 %
Expected dividend yield1.4 %1.2 %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, 2021, and for the year then ended.
Number of
PBRSUs
(in thousands)		Weighted-
Average
Fair Value at
Grant Date
Outstanding at April 30, 2020
289 $52.44 
Granted82 $73.68 
Converted to common shares(116)$46.94 
Forfeited(1)$64.67 
Outstanding at April 30, 2021
254 $61.76 
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:
201920202021
Grant-date fair value$55.29 $56.99 $73.68 
Valuation assumptions:
Risk-free interest rate2.7 %1.8 %0.1 %
Expected volatility20.8 %21.8 %29.9 %
Expected dividend yield1.2 %1.2 %1.1 %
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:
201920202021
Grant-date fair value$54.20 $53.34 $63.01 
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:
201920202021
Pre-tax compensation expense$14 $11 $12 
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:
201920202021
Intrinsic value of SSARs exercised$31 $89 $47 
Fair value of shares vested1
20 14 13 
Excess tax benefit from exercise / vesting of awards7 20 10