Consolidated Statements Of Stockholders' Equity (USD $) In Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Apr. 24, 2009	$ 0.4	$ 3,115.9	$ (2,927.4)	$ 1,600.5	$ (5.2)	$ 1,784.2
Balances, shares at Apr. 24, 2009	436.6		(104.3)
Net income	0	0	0	400.4	0	400.4
Other comprehensive income (loss), net	0	0	0	0	8.0	8.0
Issuance of common stock, net of taxes	0.1	197.0	0	0	0	197.1
Issuance of common stock, net of taxes, shares	15.0
Stock-based compensation	0	159.6	0	0	0	159.6
Income tax benefit from employee stock transactions	0	(0.9)	0	0	0	(0.9)
Settlement of note hedge	0	14.2	0	0	0	14.2
Taxes on settlement of note hedge	0	(32.1)	0	0	0	(32.1)
Balances at Apr. 30, 2010	0.5	3,453.7	(2,927.4)	2,000.9	2.8	2,530.5
Balances, shares at Apr. 30, 2010	451.6		(104.3)
Net income	0	0	0	673.1	0	673.1
Other comprehensive income (loss), net	0	0	0	0	10.0	10.0
Reclassification of equity component of convertible debt	0	(114.6)	0	0	0	(114.6)
Issuance of common stock, net of taxes	0	324.2	0	0	0	324.2
Issuance of common stock, net of taxes, shares	21.7
Stock-based compensation	0	175.2	0	0	0	175.2
Income tax benefit from employee stock transactions	0	128.5	0	0	0	128.5
Stock options assumed in business acquisition	0	3.3	0	0	0	3.3
Balances at Apr. 29, 2011	0.5	3,970.3	(2,927.4)	2,674.0	12.8	3,730.2
Balances, shares at Apr. 29, 2011	473.3		(104.3)
Net income	0	0	0	605.4	0	605.4
Other comprehensive income (loss), net	0	0	0	0	(7.9)	(7.9)
Reclassification of equity component of convertible debt	0	52.0	0	0	0	52.0
Issuance of common stock, net of taxes	0	148.8	0	0	0	148.8
Issuance of common stock, net of taxes, shares	10.2
Repurchase and retirement of common stock	0	(125.9)	0	(474.1)	0	(600.0)
Repurchase and retirement of common stock, shares	(14.6)					14.6
Stock-based compensation	0	257.6	0	0	0	257.6
Income tax benefit from employee stock transactions	0	107.5	0	0	0	107.5
Balances at Apr. 27, 2012	$ 0.5	$ 4,410.3	$ (2,927.4)	$ 2,805.3	$ 4.9	$ 4,293.6
Balances, shares at Apr. 27, 2012	468.9		(104.3)