Summary of Significant Accounting Policies (Depreciation Period By Type Of Assets) (Detail)	12 Months Ended
	Jul. 28, 2012 Year
Summary Of Significant Accounting Policies [Line Items]
Leasehold improvements, maximum useful life (in years)	5
Minimum
Summary Of Significant Accounting Policies [Line Items]
Computer equipment and related software	30
Maximum
Summary Of Significant Accounting Policies [Line Items]
Computer equipment and related software	36
Operating lease assets based on lease term, years	3
Building improvements
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, maximum useful life, years	25
Leasehold improvements
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, maximum useful life, years	10
Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, maximum useful life, years	5
Production Engineering And Other Equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, maximum useful life, years	5