Summary of Significant Accounting Policies (Depreciation Period By Type Of Assets) (Detail)	12 Months Ended
	Jul. 27, 2013
Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	25 years
Building improvements
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	10 years
Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	5 years
Leasehold Improvements [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	5 years
Leasehold Improvements [Member] | Shorter of remaining lease term [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	5 years
Computer equipment and related software [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	30 months
Computer equipment and related software [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	36 months
Production Engineering And Other Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	5 years
Operating lease assets | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, years	3 years