Business Combinations - Identified Intangible Assets (Detail) (Fiscal 2012 Acquisition, USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 25, 2014	May 06, 2011
Business Acquisition [Line Items]
Estimated Fair Value		$ 272.1
Developed Technology
Business Acquisition [Line Items]
Estimated Fair Value		216.0
Useful Life (Years)	5 years
Customer Contracts/Relationships
Business Acquisition [Line Items]
Estimated Fair Value		45.0
Useful Life (Years)	2 years
Trademarks And Trade Names
Business Acquisition [Line Items]
Estimated Fair Value		7.0
Useful Life (Years)	2 years
Order Backlog
Business Acquisition [Line Items]
Estimated Fair Value		2.5
Useful Life (Years)	0 years
Covenants not to Compete
Business Acquisition [Line Items]
Estimated Fair Value		$ 1.6
Useful Life (Years)	3 years