Selected Quarterly Financial Data (Details) (USD $) In Millions, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]
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
Gross profit	995.0	908.5	913.0	896.9	928.2	846.2	816.5	737.8	3,713.4	3,328.7	2,519.2
Income before income taxes	214.5	146.9	183.9	167.1	208.1	212.7	202.3	171.0	712.4	794.1	447.0
Net income	$ 180.7	$ 119.6	$ 165.6	$ 139.5	$ 160.6	$ 186.4	$ 175.4	$ 150.7	$ 605.4	$ 673.1	$ 400.4
Net income per share, basic	$ 0.50	$ 0.33	$ 0.46	$ 0.38	$ 0.44	$ 0.51	$ 0.49	$ 0.43	$ 1.66	$ 1.87	$ 1.18
Net income per share, diluted	$ 0.47	$ 0.32	$ 0.44	$ 0.34	$ 0.40	$ 0.46	$ 0.45	$ 0.40	$ 1.58	$ 1.71	$ 1.13