Summary of Significant Accounting Policies (Depreciation Period By Type Of Assets) (Details)	12 Months Ended
	Jul. 25, 2015
Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	25 years
Building improvements
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	10 years
Leasehold Improvements [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	10 years
Computer equipment and related software [Member] | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	30 months
Computer equipment and related software [Member] | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	36 months
Production Engineering And Other Equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	5 years
Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life, (in years, unless stated otherwise)	5 years