Pension And Postretirement Benefits (Weighted-Average Assumptions To Determine Net Periodic Benefit Costs) (Details) - Pension Plan, Defined Benefit [Member]	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.46%	4.15%	3.74%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.85%	6.86%	6.84%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.20%	3.21%	3.24%