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Stock-based Compensation (Tables)
 3 Months Ended
Oct. 28, 2018
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 28,
2018
 
October 29,
2017
Total pre-tax stock-based compensation expense
$
14

 
$
14

Tax-related benefits
$
3

 
$
5
Employee Stock Option [Member]  
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of October 28, 2018:
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
 
(Options in
thousands)
 
 
 
(In years)
 
 
Outstanding at July 29, 2018
1,537

 
$
50.36

 
 
 
 
Granted
264

 
$
36.60

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Terminated
(74
)
 
$
49.05

 
 
 
 
Outstanding at October 28, 2018
1,727

 
$
48.31

 
7.6
 
$
—

Exercisable at October 28, 2018
1,035

 
$
50.88

 
6.6
 
$
—
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The assumptions and grant-date fair values for grants in 2019 and 2018 were as follows:
 
2019
 
2018
Risk-free interest rate
2.99%
 
2.06%
Expected dividend yield
3.78%
 
2.95%
Expected volatility
25.98%
 
19.60%
Expected term
6 years
 
6 years
Grant-date fair value
$6.77
 
$6.67
Time Lapse and EPS Restricted Stock Units [Member]  
Stock-based Compensation  
Time-Lapse Restricted Stock Units and EPS 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 28, 2018:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,652

 
$
47.01

Granted
1,134

 
$
36.38

Vested
(522
)
 
$
50.10

Forfeited
(94
)
 
$
43.03

Nonvested at October 28, 2018
2,170

 
$
40.88
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 28, 2018:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,664

 
$
46.66

Granted
351

 
$
31.21

Vested
—

 
$
—

Forfeited
(629
)
 
$
58.39

Nonvested at October 28, 2018
1,386

 
$
37.41
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:
 
2019
 
2018
Risk-free interest rate
2.84%
 
1.58%
Expected dividend yield
3.78%
 
2.95%
Expected volatility
24.32%
 
19.07%
Expected term
3 years
 
3 years