Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Fiscal Period Number Of Weeks	53	52	52
TSR Performance Restricted Stock/Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Strategic Performance Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
EPS Performance Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
FCF Performance Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
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