Stockholders' Equity (Stock-Based Compensation Expense) (Details) (USD $) In Millions	12 Months Ended
	Apr. 29, 2011	Apr. 30, 2010	Apr. 24, 2009
Total stock-based compensation expense	$ 175.2	$ 159.8	$ 140.8
Cost of Product Revenues [Member]
Total stock-based compensation expense	3.6	4.0	3.3
Cost of Service Revenues [Member]
Total stock-based compensation expense	14.4	14.3	12.3
Sales and Marketing [Member]
Total stock-based compensation expense	81.5	73.7	65.1
Research and Development [Member]
Total stock-based compensation expense	44.5	38.5	37.9
General and Administrative [Member]
Total stock-based compensation expense	$ 31.2	$ 29.3	$ 22.2