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Summary of Significant Accounting Policies Stock-Based Compensation (Tables)
 12 Months Ended
Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted-average assumptions used in the Black-Scholes valuation model are reflected in the following table:

 
 
2014
 
2013
 
2012
 
 
Service-Based
 
Performance-Based
 
Service-Based
 
Performance-Based
 
Service-Based
 
Performance-Based
Black-Scholes Option Valuation Assumptions
 
Option Awards
 
Option Awards
 
Option Awards
 
Option Awards
 
Option Awards
 
Option Awards
Expected term (in years)
 
5.97

 
—

 
5.93

 
—

 
5.89

 
6.57

Expected volatility
 
37.32
%
 
—
%
 
38.67
%
 
—
%
 
39.41
%
 
39.21
%
Expected dividend yield
 
2.35
%
 
—
%
 
2.21
%
 
—
%
 
2.07
%
 
1.99
%
Risk-free interest rate
 
1.80
%
 
—
%
 
0.91
%
 
—
%
 
1.16
%
 
2.05
%
Weighted-average market value of underlying stock at grant date
 
$
30.98

 
$
—

 
$
30.58

 
$
—

 
$
27.05

 
$
29.55

Weighted-average exercise price
 
$
30.98

 
$
—

 
$
30.58

 
$
—

 
$
27.05

 
$
29.55

Weighted-average fair value of options granted during the period
 
$
9.17

 
$
—

 
$
9.05

 
$
—

 
$
8.42

 
$
10.01