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Shareholders' Equity (Tables)
 12 Months Ended
Apr. 30, 2023
Equity [Abstract]  
Summary of Changes in Outstanding Options
A summary of changes in outstanding options for the year ended April 30, 2023 is as follows:
Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term
(years)		Aggregate
Intrinsic
Value
Outstanding at May 1, 20224,540,104 $16.05 
Granted1,549,000 16.32 
Exercised(501,547)11.25 
Forfeited(163,100)16.51 
Expired(151,400)15.36
Outstanding at 4/30/2023*5,273,057 $16.59 3.6$148,083 
Exercisable at April 30, 20231,818,957 $15.47 2.5$125,643 
*amounts adjusted for rounding
Schedule of 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, 2023, 2022 and 2021:
202320222021
Dividend yield2.7 %1.7 %2.7 %
Expected volatility42.8 %41.3 %38.3 %
Risk-free interest rate3.3 %1.1 %0.3 %
Expected term5 years5 years5 years