Segment, Geographic, And Significant Customer Information (Schedule Of International Sales To Single Foreign Country) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 27, 2012	Jan. 27, 2012	Oct. 28, 2011	Jul. 29, 2011	Apr. 29, 2011	Jan. 28, 2011	Oct. 29, 2010	Jul. 30, 2010	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Segment Reporting Information [Line Items]
Net revenues	$ 1,702.5	$ 1,565.5	$ 1,507.0	$ 1,458.2	$ 1,428.3	$ 1,289.6	$ 1,251.0	$ 1,153.7	$ 6,233.2	$ 5,122.6	$ 3,931.4
Concentration risk, percentage									10.00%	10.00%	10.00%
Germany [Member]
Segment Reporting Information [Line Items]
Net revenues									$ 632.6	$ 618.0	$ 441.1