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Pension And Postretirement Benefits (Schedule of Pension Plan Weighted-Average Asset Allocation By Cateogry) (Details) - Pension Plan, Defined Benefit [Member]
Jul. 31, 2022
Aug. 01, 2021
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 33.00%  
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 34.00% 36.00%
Debt Securities [Member]    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 60.00%  
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 59.00% 57.00%
Real Estate [Member]    
Defined Benefit Plan, Information about Plan Assets [Abstract]    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 7.00%  
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 7.00% 7.00%