Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
Aug. 01, 2021	Aug. 02, 2020	Jul. 28, 2019
Fiscal Period Number Of Weeks	52	53	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

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration