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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock Options
A summary of options for the fiscal year ended April 30, 2017, is as follows:
(in 000s, except per share amounts)
 
 
 
Shares

 
Weighted-Average
Exercise Price

 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value

Outstanding, beginning of the year
 
1,976

 
$
18.76

 
 
 
 
Granted
 
23

 
20.29

 
 
 
 
Exercised
 
(162
)
 
16.03

 
 
 
 
Forfeited or expired
 
(135
)
 
31.98

 
 
 
 
Outstanding, end of the year
 
1,702

 
$
17.99

 
4 years
 
$
11,651

 
 
 
 
 
 
 
 
 
Exercisable, end of the year
 
1,675

 
$
17.93

 
4 years
 
$
11,549

Exercisable and expected to vest
 
1,699

 
$
17.99

 
4 years
 
$
11,640

 
 
 
 
 
 
 
 
 
Summary Of Nonvested Shares
A summary of nonvested shares, nonvested share units and deferred stock units, including those that are performance-based, for the year ended April 30, 2017, is as follows:
(shares in 000s)
 
 
 
Nonvested Shares and Nonvested Share Units
 
Performance-Based Nonvested Share Units
 
 
Shares
 
Weighted-Average
Grant Date 
Fair Value

 
Shares
 
Weighted-Average
Grant Date 
Fair Value

Outstanding, beginning of the year
 
1,513

 
$
26.21

 
1,099

 
$
31.86

Granted
 
716

 
23.61

 
462

 
25.38

Released
 
(411
)
 
30.65

 
(270
)
 
28.55

Forfeited
 
(202
)
 
29.80

 
(192
)
 
30.12

Outstanding, end of the year
 
1,616

 
$
23.50

 
1,099

 
$
30.22

 
 
 
 
 
 
 
 
 
Assumptions Used To Value Options
The following assumptions were used to value options during the periods:
Year ended April 30,
 
2017

 
2016

 
2015

Options - management and director:
 
 
 
 
 
 
Expected volatility
 
29.43%

 
22.95%-24.87%

 
26.25%

Expected term
 
4 years

 
4 years

 
4 years

Dividend yield
 
3.94%

 
2.26%-2.69%

 
2.62%

Risk-free interest rate
 
1.18%

 
1.29%-1.43%

 
1.43%

Weighted-average fair value
 
$
3.31

 
$
5.28

 
$
5.18

 
 
 
 
 
 
 
Performance-Based Nonvested Share Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used To Value Options
The following assumptions were used to value performance-based nonvested share units using the Monte Carlo valuation model during the periods:
Year ended April 30,
 
2017

 
2016

 
2015

Expected volatility
 
13.92% - 74.53%

 
12.85% - 55.27%

 
12.28% - 78.42%

Expected term
 
3 years

 
3 years

 
3 years

Dividend yield (1)
 
0% - 3.68%

 
0% - 2.70%

 
0% - 2.39%

Risk-free interest rate
 
0.84
%
 
0.95
%
 
0.81
%
Weighted-average fair value
 
$
25.38

 
$
30.00

 
$
37.17

 
 
 
 
 
 
 
(1) 
The valuation model assumes that dividends are reinvested by the Company on a continuous basis.