Description of Business and Significant Accounting Policies - Property and Equipment Depreciation Life (Detail)	12 Months Ended
	Apr. 25, 2014
Building
Property, Plant and Equipment [Line Items]
Depreciation life (years)	40 years
Building Improvements
Property, Plant and Equipment [Line Items]
Depreciation life (years)	10 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Depreciation life (years)	5 years
Computer, Production, Engineering And Other Equipment
Property, Plant and Equipment [Line Items]
Depreciation life (years)	3 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Depreciation life (years)	3 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Depreciation life (years)	5 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Depreciation life (years)	Shorter of remaining lease term or useful life