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Pension And Postretirement Benefits Pension And Postretirement Benefits (Schedule Of Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
Pension and Postretirement Benefits [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.25%	8.25%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%	4.50%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2020	2019

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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