Pension And Postretirement Benefits (Schedule of Pension Plan Weighted-Average Asset Allocations By Category) (Details) (Pension Plans, Defined Benefit [Member])	12 Months Ended
	Jul. 28, 2013	Jul. 29, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	51.00%
Defined Benefit Plan, Actual Plan Asset Allocations	54.00%	48.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	35.00%
Defined Benefit Plan, Actual Plan Asset Allocations	32.00%	36.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	14.00%
Defined Benefit Plan, Actual Plan Asset Allocations	14.00%	16.00%