Description of Business and Significant Accounting Policies - Property and Equipment Depreciation Life (Detail)	12 Months Ended
	Apr. 26, 2019
Furniture and fixtures
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
Minimum | Buildings and improvements
Property Plant And Equipment [Line Items]
Depreciation life (years)	10 years
Minimum | Computer, production, engineering and other equipment
Property Plant And Equipment [Line Items]
Depreciation life (years)	2 years
Minimum | Computer software
Property Plant And Equipment [Line Items]
Depreciation life (years)	3 years
Maximum | Buildings and improvements
Property Plant And Equipment [Line Items]
Depreciation life (years)	40 years
Maximum | Computer, production, engineering and other equipment
Property Plant And Equipment [Line Items]
Depreciation life (years)	3 years
Maximum | Computer software
Property Plant And Equipment [Line Items]
Depreciation life (years)	5 years