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Stock-based Compensation (Tables)
 3 Months Ended
Nov. 01, 2020
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 Earnings from continuing operations were as follows:
Three Months Ended
 November 1,
2020		October 27,
2019
Total pre-tax stock-based compensation expense$16 $13 
Tax-related benefits$3 $3 
Total pre-tax stock-based compensation expense and tax-related benefits recognized in Earnings (loss) from discontinued operations were as follows:
Three Months Ended
 October 27,
2019
Total pre-tax stock-based compensation expense$1 
Tax-related benefits$— 
Share-based Payment Arrangement, Option [Member]  
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of November 1, 2020:
OptionsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life		Aggregate
Intrinsic
Value
(Options in
thousands)		 (In years) 
Outstanding at August 2, 20201,423 $45.42 
Granted— $— 
Exercised— $— 
Terminated— $— 
Outstanding at November 1, 20201,423 $45.42 6.7$6 
Exercisable at November 1, 20201,069 $48.74 6.2$2 
Time Lapse, EPS Performance, And FCF Performance Restricted Stock Units [Member]  
Stock-based Compensation  
Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units and FCF Performance Restricted Stock Units[Table Text Block]
The following table summarizes time-lapse restricted stock units, EPS performance restricted stock units and FCF performance restricted stock units as of November 1, 2020:
UnitsWeighted-Average Grant-Date Fair Value
 (Restricted stock
units in thousands)		 
Nonvested at August 2, 20201,866 $43.18 
Granted875 $48.43 
Vested(715)$42.82 
Forfeited(62)$47.10 
Nonvested at November 1, 20201,964 $45.54 
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 November 1, 2020:
UnitsWeighted-Average Grant-Date Fair Value
 (Restricted stock
units in thousands)		 
Nonvested at August 2, 20201,254 $47.83 
Granted521 $54.93 
Vested(236)$39.39 
Forfeited(252)$40.35 
Nonvested at November 1, 20201,287 $53.71 
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:
 20212020
Risk-free interest rate0.15%1.48%
Expected dividend yield2.85%2.95%
Expected volatility29.99%27.01%
Expected term3 years3 years