Goodwill And Other Intangible Assets, Net (Amortization Expense For Identified Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 89.0	$ 17.7	$ 20.6
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	55.8	13.3	17.2
Customer Contracts/Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	28.1	3.0	2.4
Trademarks And Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	4.2	1.2	1.0
Covenants Not To Compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 0.9	$ 0.2	$ 0