Pension And Postretirement Benefits (Weighted-Average Assumptions To Determine Net Periodic Benefit Costs) (Details) - Pension Plan, Defined Benefit [Member]	12 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
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	4.15%	3.74%	3.39%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.86%	6.84%	7.09%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.21%	3.24%	3.25%