Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Oct. 26, 2011	Oct. 27, 2010	Oct. 26, 2011	Oct. 27, 2010	Apr. 27, 2011
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 57,100,000		$ 57,100,000		$ 70,700,000
Unrecognized tax benefits that would impact effective tax rate	45,100,000		45,100,000		56,500,000
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	16,700,000		16,700,000
Unrecognized tax benefits, interest on income taxes accrued	18,700,000		18,700,000		27,300,000
Unrecognized tax benefits, income tax penalties accrued	17,800,000		17,800,000		21,100,000
International sales percent			70.00%
Deferred Tax Liabilities [Abstract]
Tax benefit related to revaluation	(52,857,000)	(92,588,000)	(124,003,000)	(176,784,000)
Foreign income tax liability related to revaluation paid in Fiscal 2013	133,294,000		133,294,000		98,325,000	[1]
Cash taxes, tax amortization period			five
Effective tax rate			20.70%	26.00%
Foreign Subsidiary [Member] | Assets Revaluation [Member]
Deferred Tax Liabilities [Abstract]
Increase in local tax basis of a foreign subsidiary	220,200,000
Tax benefit related to revaluation	34,900,000
Deferred Income Tax Liabilities	34,800,000		34,800,000
Foreign income tax liability related to revaluation paid in Fiscal 2012	10,400,000
Foreign income tax liability related to revaluation paid in Fiscal 2013	13,900,000		13,900,000
Total improvement to cash flow from operations related to revaluation	$ 69,100,000

[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.