Pension And Postretirement Benefits (Schedule of Pension Plan Weighted-Average Asset Allocation By Cateogry) (Details) - Pension Plan, Defined Benefit [Member]	Jul. 28, 2024	Jul. 30, 2023
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	20.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	20.00%	27.00%
Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	74.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	73.00%	66.00%
Real Estate [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	6.00%
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	7.00%	7.00%