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Share-Based Payments (Tables)
 12 Months Ended
Apr. 30, 2020
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 in 2020:
2020
Expected volatility (%)20.1 %
Dividend yield (%)2.8 %
Risk-free interest rate (%)1.9 %
Expected life of stock options (years)6.0
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, 2019400,000  $113.24  
Granted193,831  121.93  
Exercised(62,750) 111.66  
Cancelled(42,026) 120.67  
Outstanding at April 30, 2020489,055  $116.25  
Exercisable at April 30, 2020314,750  $113.21  
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		Performance
Units		Weighted-
Average
Conversion
Date Fair Value
Outstanding at May 1, 2019583,576  $118.44  85,154  $123.68  
Granted245,945  121.19  168,212  123.68  
Converted85,154  123.68  (85,154) 123.68  
Vested(123,714) 119.13  —  —  
Forfeited(54,277) 117.30  (14,995) 123.68  
Outstanding at April 30, 2020736,684  $119.93  153,217  $123.68  
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		Performance
Units		Weighted-
Average Conversion
Date Fair Value
2020245,945  $121.19  168,212  $123.68  
2019194,932  104.33  85,154  123.68  
2018136,127  126.80  84,051  103.86