Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Fiscal Period Number Of Weeks		52	52	52
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life		45 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life		20 years
Scenario, Forecast [Member]
Fiscal Period Number Of Weeks	53