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Stock-based Compensation (Tables)
 3 Months Ended
Oct. 30, 2016
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of October 30, 2016:
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
 
(Options in
thousands)
 
 
 
(In years)
 
 
Outstanding at July 31, 2016
681

 
$
50.21

 
 
 
 
Granted
489

 
$
54.65

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Terminated
(95
)
 
$
52.49

 
 
 
 
Outstanding at October 30, 2016
1,075

 
$
52.02

 
9.3
 
$
3

Exercisable at October 30, 2016
227

 
$
50.21

 
8.9
 
$
1
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 October 30, 2016:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 31, 2016
2,004

 
$
45.08

Granted
520

 
$
54.72

Vested
(905
)
 
$
43.87

Forfeited
(307
)
 
$
42.05

Nonvested at October 30, 2016
1,312

 
$
50.45
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The assumptions and grant-date fair values for grants in 2017 and 2016 were as follows:
 
2017
 
2016
Risk-free interest rate
1.28%
 
1.68%
Expected dividend yield
2.26%
 
2.46%
Expected volatility
18.64%
 
18.35%
Expected term
6 years
 
6 years
Grant-date fair value
$7.51
 
$6.86
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 October 30, 2016:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 31, 2016
1,641

 
$
49.13

Granted
606

 
$
39.53

Vested
(251
)
 
$
36.26

Forfeited
(124
)
 
$
41.58

Nonvested at October 30, 2016
1,872

 
$
48.25
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:
 
2017
 
2016
Risk-free interest rate
0.85%
 
0.92%
Expected dividend yield
2.26%
 
2.46%
Expected volatility
17.78%
 
17.25%
Expected term
3 years
 
3 years