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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock options and SSARs granted under the plan
The following table presents information about stock options and stock-settled stock appreciation rights (SSARs) granted under the Plan (or its predecessor plans) as of April 30, 2018, and for the year then ended.
 
Number of
Underlying
Shares
(in thousands)
 
Weighted
Average
Exercise Price
per Award
 
Weighted
Average
Remaining
Contractual
Term (years)
 
Aggregate
Intrinsic Value
Outstanding at April 30, 2017
8,278

 
$
25.74

 
 
 
 
Granted
1,059

 
39.07

 
 
 
 
Exercised
(2,116
)
 
17.11

 
 
 
 
Forfeited or expired
(6
)
 
36.05

 
 
 
 
Outstanding at April 30, 2018
7,215

 
$
29.67

 
5.4
 
$
190

Exercisable at April 30, 2018
4,335

 
$
23.17

 
3.7
 
$
142
Assumptions used for fair value estimation
We estimated the fair values using the Black-Scholes pricing model with the following assumptions: 
 
2016
 
2017
 
2018
Risk-free interest rate
2.1
%
 
1.4
%
 
2.2
%
Expected volatility
19.1
%
 
16.3
%
 
15.6
%
Expected dividend yield
1.6
%
 
1.6
%
 
1.5
%
Expected term (years)
6.75

 
7.00

 
7.00
Summary of changes in outstanding RSUs and restricted stock
The following table summarizes the changes in the number of shares underlying these awards during 2018.
 
Number of
Underlying Shares
(in thousands)
 
Weighted
Average
Fair Value at
Grant Date
Nonvested at April 30, 2017
601

 
$
36.50

Granted
165

 
33.68

Adjusted for dividends or performance
43

 
50.47

Vested
(136
)
 
34.52

Forfeited
(3
)
 
39.40

Nonvested at April 30, 2018
670

 
$
39.84