Basis of Presentation and Significant Accounting Policies (Details)	12 Months Ended
Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010
Fiscal Period Number Of Weeks	52	52	52
Buildings [Member]
Property, plant and equipment maximum useful life	45
Machinery And Equipment [Member]
Property, plant and equipment maximum useful life	20

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration