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Pension And Postretirement Benefits (Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost) (Details) (Pension [Member])	12 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Aug. 02, 2009
Pension [Member]
Discount rate	5.46%	6.00%	6.87%
Expected return on plan assets	8.15%	8.13%	8.60%
Rate of compensation increase	3.29%	3.29%	3.97%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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