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Stock-based Compensation (Tables)
 3 Months Ended
Oct. 29, 2017
Stock-based Compensation  
Summary of Stock-based Compensation Expense [Table Text Block]
Total pre-tax stock-based compensation expense and tax-related benefits recognized in the Consolidated Statements of Earnings were as follows:
 
Three Months Ended
 
October 29,
2017
 
October 30,
2016
Total pre-tax stock-based compensation expense
$
14

 
$
14

Tax-related benefits
$
5

 
$
5
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of October 29, 2017:
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
 
(Options in
thousands)
 
 
 
(In years)
 
 
Outstanding at July 30, 2017
1,042

 
$
52.08

 
 
 
 
Granted
575

 
$
47.19

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Terminated
—

 
$
—

 
 
 
 
Outstanding at October 29, 2017
1,617

 
$
50.34

 
8.9
 
$
1

Exercisable at October 29, 2017
544

 
$
51.40

 
8.2
 
$
—
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 and EPS performance restricted stock units as of October 29, 2017:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 30, 2017
1,221

 
$
50.86

Granted
657

 
$
46.88

Vested
(602
)
 
$
48.33

Forfeited
(21
)
 
$
51.00

Nonvested at October 29, 2017
1,255

 
$
49.99
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The assumptions and grant-date fair values for grants in 2018 and 2017 were as follows:
 
2018
 
2017
Risk-free interest rate
2.06%
 
1.28%
Expected dividend yield
2.95%
 
2.26%
Expected volatility
19.60%
 
18.64%
Expected term
6 years
 
6 years
Grant-date fair value
$6.67
 
$7.51
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 29, 2017:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 30, 2017
1,774

 
$
48.24

Granted
943

 
$
39.39

Vested
(815
)
 
$
43.39

Forfeited
(28
)
 
$
47.91

Nonvested at October 29, 2017
1,874

 
$
46.25
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:
 
2018
 
2017
Risk-free interest rate
1.58%
 
0.85%
Expected dividend yield
2.95%
 
2.26%
Expected volatility
19.07%
 
17.78%
Expected term
3 years
 
3 years