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Stock-based Compensation (Tables)
 12 Months Ended
Jul. 31, 2016
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of July 31, 2016:
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
 
(Options in
thousands)
 
 
 
(In years)
 
 
Outstanding at August 2, 2015
74

 
$
29.91

 
 
 
 
Granted
711

 
$
50.21

 
 
 
 
Exercised
(74
)
 
$
29.91

 
 
 
 
Terminated
(30
)
 
$
50.21

 
 
 
 
Outstanding at July 31, 2016
681

 
$
50.21

 
9.2

 
$
8

Exercisable at July 31, 2016
—

 
$
—

 
—

 
$
—
Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units And Strategic Performance Restricted Stock Units[Table Text Block]
The following table summarizes time-lapse restricted stock units, EPS performance restricted stock units, strategic performance restricted stock units and special performance restricted stock units as of July 31, 2016:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at August 2, 2015
2,410

 
$
41.40

Granted
698

 
$
50.44

Vested
(862
)
 
$
39.50

Forfeited
(242
)
 
$
43.73

Nonvested at July 31, 2016
2,004

 
$
45.08
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The following weighted-average assumptions were used for grants in 2016:
 
2016
Risk-free interest rate
1.68%
Expected dividend yield
2.46%
Expected volatility
18.35%
Expected term
6 years
TSR Performance Restricted Stock/Units [Member]  
Stock-based Compensation  
TSR Performance Restricted Stock Units [Table Text Block]
The following table summarizes TSR performance restricted stock units as of July 31, 2016:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at August 2, 2015
1,579

 
$
40.75

Granted
682

 
$
62.44

Vested
(438
)
 
$
39.76

Forfeited
(182
)
 
$
48.77

Nonvested at July 31, 2016
1,641

 
$
49.13
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
We estimated the fair value of TSR performance restricted stock units at the grant date using a Monte Carlo simulation. Assumptions used in the Monte Carlo simulation were as follows:
 
2016
 
2015
 
2014
Risk-free interest rate
0.92%
 
0.97%
 
0.60%
Expected dividend yield
2.46%
 
2.91%
 
2.98%
Expected volatility
17.25%
 
16.20%
 
15.76%
Expected term
3 years
 
3 years
 
3 years