Goodwill and Intangible Assets (Narrative) (Details)	9 Months Ended
	May 01, 2011	May 02, 2010
Goodwill and Intangible Assets
Amortization of amortizable intangible assets	less than $1	less than $1
Estimated aggregated amortization expense year one	less than $1
Estimated aggregated amortization expense year two	less than $1
Estimated aggregated amortization expense year three	less than $1
Estimated aggregated amortization expense year four	less than $1
Estimated aggregated amortization expense year five	less than $1
Asset useful lives minimum range, years	10
Asset useful lives maximum range, years	20