Business Combinations (Identified Intangible Assets) (Details) (Engenio External Storage Systems Business [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	May 06, 2011
Business Acquisition [Line Items]
Total identified intangible assets, Fair Value		$ 272.1
Developed Technology [Member]
Business Acquisition [Line Items]
Fair Value		216.0
Useful Life (Years)	5 years
Customer Contracts/Relationships [Member]
Business Acquisition [Line Items]
Fair Value		45.0
Useful Life (Years)	2 years
Trademarks And Trade Names [Member]
Business Acquisition [Line Items]
Fair Value		7.0
Useful Life (Years)	2 years
Order Backlog [Member]
Business Acquisition [Line Items]
Fair Value		2.5
Useful Life (Years)	0 years
Covenants Not To Compete [Member]
Business Acquisition [Line Items]
Fair Value		$ 1.6
Useful Life (Years)	3 years