Description of Business and Significant Accounting Policies - Property and Equipment Depreciation Life (Detail)	12 Months Ended
	Apr. 24, 2015
Buildings and improvements | Minimum
Property Plant And Equipment [Line Items]
Depreciation life (years)	10 years
Buildings and improvements | Maximum
Property Plant And Equipment [Line Items]
Depreciation life (years)	40 years
Furniture and fixtures
Property Plant And Equipment [Line Items]
Depreciation life (years)	5 years
Computer, production, engineering and other equipment | Minimum
Property Plant And Equipment [Line Items]
Depreciation life (years)	2 years
Computer, production, engineering and other equipment | Maximum
Property Plant And Equipment [Line Items]
Depreciation life (years)	3 years
Computer software | Minimum
Property Plant And Equipment [Line Items]
Depreciation life (years)	3 years
Computer 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