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Share-Based Payments (Tables)
 12 Months Ended
Apr. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Weighted-average Black-Scholes assumptions for stock options granted
The fair value of each stock option is estimated on the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumptions for stock options granted:
202420232022
Expected volatility25.0 %25.0 %24.0 %
Dividend yield2.7 %3.1 %2.7 %
Risk-free interest rate3.9 %3.6 %1.0 %
Expected life of stock options (years)6.06.06.0
Summary of the Company's stock option activity and related information
The following table is a summary of our stock option activity.
Number of 
Stock Options		Weighted-Average
Exercise Price
Outstanding at May 1, 2023606,478 $121.33 
Granted84,568 153.26 
Exercised(26,434)120.18 
Cancelled(7,653)140.62 
Outstanding at April 30, 2024
656,959 $125.40 
Exercisable at April 30, 2024
476,110 $119.96 
Summary of restricted shares, deferred shares, deferred stock units, and performance units The following table is a summary of our restricted shares, deferred stock units, and performance units.
Restricted Shares
and Deferred
Stock Units		Weighted-Average
Grant Date Fair Value Per Share		Performance
Units		Weighted-Average
Grant Date Fair Value Per Share
Outstanding at May 1, 2023
354,724 $126.45 413,890 $126.78 
Granted155,354 143.60 117,312 153.20 
Vested(218,698)127.36 (74,548)113.71 
Forfeited(34,623)108.58 (103,258)120.31 
Outstanding at April 30, 2024
256,757 $138.46 353,396 $140.20 
Weighted-average grant date fair values of the equity awards The following table summarizes the weighted-average fair values of the equity awards granted.
Year Ended April 30,Restricted Shares
and Deferred
Stock Units		Weighted-Average
Grant Date Fair Value Per Share		Performance
Units		Weighted-Average
Grant Date Fair Value Per Share
2024155,354 $143.60 117,312 $153.20 
2023146,290 131.96 130,939 133.01 
202266,514 135.10 171,907 135.53