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Stock-Based Compensation (Tables)
9 Months Ended
Apr. 30, 2013
Text Block [Abstract]  
Stock Option Assumptions
The weighted-average assumptions used in the Black-Scholes valuation model are reflected in the following table:
 
 
 
Nine months ended April 30, 2013
 
Nine months ended April 30, 2012
 
 
Service-Based
 
Performance-
Based
 
Service-Based
 
Performance-
Based
Black-Scholes Option Valuation Assumptions
 
Option Awards
 
Option Awards
 
Option Awards
 
Option Awards
Expected term (in years)
 
5.94

 

 
5.89

 
6.57

Expected volatility
 
38.68
%
 

 
39.41
%
 
39.21
%
Expected dividend yield
 
2.21
%
 

 
2.07
%
 
1.99
%
Risk-free interest rate
 
0.90
%
 

 
1.16
%
 
2.05
%
Weighted-average market value of underlying stock at grant date
 
$
30.54

 
$

 
$
27.05

 
$
29.55

Weighted-average exercise price
 
$
30.54

 
$

 
$
27.05

 
$
29.55

Weighted-average fair value of options granted during the period
 
$
9.05

 
$

 
$
8.42

 
$
10.01

Summary of Stock Option Activity under Company's Share-Based Compensation Plans
A summary of stock option activity under the Company’s share-based compensation plans for the nine months ended April 30, 2013 is presented below:
Options
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
Outstanding at July 31, 2012
 
6,253,751
 
$
29.24

 
 
 
 
New grants
 
815,450
 
$
30.54

 
 
 
 
Exercised
 
(642,579)
 
$
21.22

 
 
 
 
Forfeited or expired
 
(519,272)
 
$
30.52

 
 
 
 
Outstanding at April 30, 2013
 
5,907,350
 
$
30.18

 
6.5
 
$
25,094

Exercisable at April 30, 2013
 
3,736,320
 
$
30.70

 
4.9
 
$
15,728