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Share-Based Payments (Tables)
12 Months Ended
Apr. 30, 2015
Share-Based Payments [Abstract]  
Weighted average Black-Scholes assumptions for stock options granted

 

 

 

 

 

 

 

  

2015

 

Expected volatility (%)

  

 

25.0

Dividend Yield (%)

  

 

2.2

Risk-free interest rate (%)

  

 

1.5

Expected life of stock option (years)

  

 

5.6

  

 

Summary of the Company's stock option activity and related information

 

 

 

 

 

 

 

 

 

 

 

  

Number
of Options

 

  

Weighted-Average
Exercise Price

 

Outstanding at May 1, 2014

  

 

33,667

  

  

$

44.50

  

Granted

  

 

955,000

  

  

 

112.59

  

Exercised

  

 

31,667

  

  

 

44.29

  

 

  

 

 

 

  

 

 

 

Outstanding at April 30, 2015

 

 

957,000

  

 

$

112.45

  

Exercisable at April 30, 2015

 

 

2,000

  

 

$

47.78

  

 

  

 

 

 

  

 

 

 

 

Summary of restricted shares, deferred shares, deferred stock units, and performance units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

Restricted Shares
and Deferred
Stock Units

 

  

Weighted-Average
Grant Date
Fair Value

 

  

Performance
Units

 

  

Weighted-Average
Conversion Date
Fair Value

 

Outstanding at May 1, 2014

  

 

839,188

  

  

$

76.54

  

  

 

101,020

  

  

$

104.91

  

Granted

  

 

109,091

  

  

 

104.82

  

  

 

75,848

  

  

 

111.41

  

Converted

  

 

101,020

  

  

 

104.91

  

  

 

(101,020)

 

  

 

104.91

  

Vested

  

 

(416,328)

 

  

 

68.59

  

  

 

—  

  

  

 

—  

  

Forfeited

  

 

(36,082)

 

  

 

90.65

  

  

 

—  

  

  

 

—  

  

 

  

 

 

 

  

 

 

 

  

 

 

 

  

 

 

 

Outstanding at April 30, 2015

 

 

596,889

  

 

$

91.21

  

 

 

75,848

  

 

$

111.41

  

 

  

 

 

 

  

 

 

 

  

 

 

 

  

 

 

 

 

Weighted-average grant date fair values of the equity awards

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended April 30,

  

Restricted Shares
and Deferred
Stock Units

 

  

Weighted-Average
Grant Date
Fair Value

 

  

Performance
Units

 

  

Weighted-Average
Conversion Date
Fair Value

 

2015

  

 

109,091

  

  

$

104.82

  

  

 

75,848

  

  

$

111.41

  

2014

  

 

167,134

  

  

 

101.08

  

  

 

101,020

  

  

 

104.91

  

2013

  

 

109,770

  

  

 

76.37

  

  

 

106,666

  

  

 

100.54