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Stock-based Compensation (Tables)
 6 Months Ended
Jan. 27, 2019
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
 
Six Months Ended
 
January 27,
2019
 
January 28,
2018
 
January 27,
2019
 
January 28,
2018
Total pre-tax stock-based compensation expense
$
17

 
$
18

 
$
31

 
$
32

Tax-related benefits
3

 
$
2

 
$
6

 
$
7
Employee Stock Option [Member]  
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of January 27, 2019:
 
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
596

 
$
35.74

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Terminated
(74
)
 
$
49.05

 
 
 
 
Outstanding at January 27, 2019
2,059

 
$
46.17

 
7.8
 
$
—

Exercisable at January 27, 2019
1,035

 
$
50.88

 
6.4
 
$
—
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The weighted-average assumptions and grant-date fair values for grants in 2019 and 2018 were as follows:
 
2019
 
2018
Risk-free interest rate
2.79%
 
2.06%
Expected dividend yield
3.84%
 
2.95%
Expected volatility
25.28%
 
19.60%
Expected term
6.1 years
 
6 years
Grant-date fair value
$6.27
 
$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 January 27, 2019:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,652

 
$
47.01

Granted
1,171

 
$
36.35

Vested
(641
)
 
$
47.90

Forfeited
(188
)
 
$
41.50

Nonvested at January 27, 2019
1,994

 
$
40.98
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 January 27, 2019:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,664

 
$
46.66

Granted
388

 
$
31.29

Vested
—

 
$
—

Forfeited
(689
)
 
$
56.57

Nonvested at January 27, 2019
1,363

 
$
37.28
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. Weighted-average assumptions used in the Monte Carlo simulations were as follows:
 
2019
 
2018
Risk-free interest rate
2.80%
 
1.58%
Expected dividend yield
3.79%
 
2.95%
Expected volatility
24.50%
 
19.07%
Expected term
3 years
 
3 years