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Pension And Postretirement Benefits (Schedule Of Assumed Health Care Cost Trend Rates) (Details) - Other Postretirement Benefit Plan, Defined Benefit [Member]
12 Months Ended
Aug. 02, 2020
Jul. 28, 2019
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 6.25% 6.25%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50% 4.50%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2024 2023