Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016
Fiscal Period Duration	364 days	364 days	364 days
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