Derivative Financial Instruments and Hedging Activities 3 (Details) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended
	Jul. 28, 2010	Jan. 25, 2012	Apr. 27, 2011	Jan. 25, 2012 Forward Contracts [Member]	Jan. 26, 2011 Forward Contracts [Member]	Jan. 25, 2012 Forward Contracts [Member]	Jan. 26, 2011 Forward Contracts [Member]	Dec. 01, 2011 U.S. Dollar Remarketable Securities [Member]	Jan. 25, 2012 Interest Rate Swap [Member]
Derivative Financial Instruments and Hedging Activities (Textuals) [Abstract]
Notional amount of foreign currency derivatives		$ 1,960,000,000	$ 1,860,000,000
Notional amount of interest rate derivatives		760,000,000	1,510,000,000
Notional amount of cross currency interest rate swap		398,600,000	377,300,000
Cash proceeds from termination of foreign currency forward contracts	11,600,000
Maturity date of foreign currency forward contracts		2014
Derivative, Remaining Maturity									3 years
Total rate of return swap								119,000,000
Number of year company decided for forecasting hedging transaction		4
Net deferred gains/(losses) reported in AOCI to be reclassified to earnings within twelve months		300,000
Notional amount of foreign currency derivative instruments not designated as hedging Instruments		426,000,000	309,900,000
Net unrealized gain/(loss) related to outstanding nondesignated derivative instruments		(5,700,000)	8,300,000
Gain due to foreign currencies forward contracts				6,200,000	200,000	11,400,000
Loss due to foreign currencies forward contracts							(12,800,000)
Notional Amount of Interest Rate Derivative Instruments Not Designated as Hedging Instruments									119,000,000
Reduction in interest income earned on total rate of return swap									900,000
Net unrealized losses related to total rate of return swap									700,000
Restricted cash collateral balance									$ 34,100,000