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Shareholders' Equity (Tables)
 12 Months Ended
Apr. 30, 2019
Equity [Abstract]  
Summary of Changes in Outstanding Options
A summary of changes in outstanding options for the year ended April 30, 2019 is as follows:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(years)
 
Aggregate
Intrinsic
Value
Outstanding at May 1, 2018
3,275,836

 
$
9.90

 
 
 
 
Granted
1,313,000

 
12.41

 
 
 
 
Exercised
(602,176
)
 
8.89

 
 
 
 
Forfeited
(1,600
)
 
9.55

 
 
 
 
Expired
(2,000
)
 
8.11

 
 
 
 
Outstanding at April 30, 2019
3,983,060

 
$
10.88

 
3.8
 
$
8,662,677

Exercisable at April 30, 2019
1,086,180

 
$
9.80

 
2.6
 
$
3,418,476
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, 2019, 2018, and 2017:
 
2019
 
2018
 
2017
Dividend yield
3.6
%
 
3.9
%
 
4.0
%
Expected volatility
30.0
%
 
28.9
%
 
32.7
%
Risk-free interest rate
2.9
%
 
1.9
%
 
1.2
%
Expected term
5 years

 
5 years

 
5 years