Pension And Postretirement Benefits (Weighted-Average Assumptions To Determine Net Periodic Benefit Costs) (Details) - Pension Plan, Defined Benefit [Member]	12 Months Ended
	Aug. 01, 2021	Aug. 02, 2020	Jul. 28, 2019
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	2.47%	3.46%	4.15%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.01%	6.85%	6.86%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.23%	3.20%	3.21%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate	4.00%	4.00%	3.25%