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Shareholders' Equity (Tables)
 12 Months Ended
Apr. 30, 2022
Equity [Abstract]  
Summary of Changes in Outstanding Options
A summary of changes in outstanding options for the year ended April 30, 2022 is as follows:
Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term
(years)		Aggregate
Intrinsic
Value
Outstanding at May 1, 20214,109,733 $13.33 
Granted1,458,500 21.54 
Exercised(776,129)11.06 
Forfeited(245,000)19.24 
Expired(7,000)9.69
Outstanding at 4/30/2022*4,540,104 $16.05 3.7$10,585,462 
Exercisable at April 30, 20221,315,604 $13.43 2.6$4,945,472 
*amounts adjusted for rounding
Fair Value of Option Award Estimated Using Black-Scholes Option Pricing Model The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the years ended April 30, 2022, 2021, and 2020:
202220212020
Dividend yield1.7 %2.7 %2.8 %
Expected volatility41.3 %38.3 %30.9 %
Risk-free interest rate1.1 %0.3 %1.6 %
Expected term5 years5 years5 years