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Stock-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2016
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, 2016, 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
 
2,613

 
$
17.71

 
 
 
 
Granted
 
112

 
34.73

 
 
 
 
Exercised
 
(707
)
 
16.85

 
 
 
 
Forfeited or expired
 
(42
)
 
27.15

 
 
 
 
Outstanding, end of the year
 
1,976

 
$
18.76

 
5 years
 
$
4,812

 
 
 
 
 
 
 
 
 
Exercisable, end of the year
 
1,871

 
$
17.85

 
5 years
 
$
4,812

Exercisable and expected to vest
 
1,961

 
$
18.64

 
5 years
 
$
4,812

 
 
 
 
 
 
 
 
 
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, 2016, 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
 
1,487

 
$
24.05

 
1,192

 
$
26.26

Granted
 
593

 
30.58

 
912

 
30.00

Released
 
(511
)
 
24.26

 
(980
)
 
16.74

Forfeited
 
(56
)
 
30.11

 
(25
)
 
33.45

Outstanding, end of the year
 
1,513

 
$
26.21

 
1,099

 
$
31.86

 
 
 
 
 
 
 
 
 
Assumptions Used To Value Options
The following assumptions were used to value options during the periods:
Year ended April 30,
 
2016

 
2015

 
2014

Options - management and director:
 
 
 
 
 
 
Expected volatility
 
22.95%-24.87%

 
26.25%

 
30.89% - 31.57%

Expected term
 
4 years

 
4 years

 
4 years

Dividend yield
 
2.26%-2.69%

 
2.62%

 
2.77% - 2.87%

Risk-free interest rate
 
1.29%-1.43%

 
1.43%

 
1.06% - 1.31%

Weighted-average fair value
 
$
5.28

 
$
5.18

 
$
5.57

 
 
 
 
 
 
 
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,
 
2016

 
2015

 
2014

Expected volatility
 
12.85% - 55.27%

 
12.28% - 78.42%

 
11.75% – 70.17%

Expected term
 
3 years

 
3 years

 
3 years

Dividend yield (1)
 
0% - 2.70%

 
0% - 2.39%

 
0% – 2.88%

Risk-free interest rate
 
0.95
%
 
0.81
%
 
0.61
%
Weighted-average fair value
 
$
30.00

 
$
37.17

 
$
28.59

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