Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Oct. 28, 2012	Oct. 26, 2011	Oct. 28, 2012	Oct. 26, 2011	Apr. 29, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 43,000,000		$ 43,000,000		$ 52,700,000
Unrecognized tax benefits that would impact effective tax rate	35,000,000		35,000,000		38,900,000
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	17,600,000		17,600,000
Unrecognized tax benefits, interest on income taxes accrued	15,900,000		15,900,000		16,000,000
Unrecognized tax benefits, income tax penalties accrued	12,500,000		12,500,000		13,800,000
International sales percent			70.00%
Deferred Tax Liabilities [Abstract]
Tax benefit related to revaluation	(31,037,000)	(52,999,000)	(92,624,000)	(124,505,000)
Foreign income tax liability related to revaluation paid in Fiscal 2013	76,296,000		76,296,000		101,540,000	[1]
Effective tax rate	13.80%	20.70%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(2.00%)	(2.00%)
Foreign Subsidiary [Member] | Tax Free Reorganization [Member]
Deferred Tax Liabilities [Abstract]
Tax benefit related to revaluation	(63,000,000)
Total improvement to cash flow from operations related to revaluation	91,000,000
Foreign Subsidiary [Member] | Assets Revaluation [Member]
Deferred Tax Liabilities [Abstract]
Increase (Decrease) in Deferred Tax Assets	82,100,000	220,200,000
Tax benefit related to revaluation		(34,900,000)	(12,900,000)
Deferred Income Tax Liabilities	13,100,000	34,800,000	13,100,000	34,800,000
Foreign income tax liability related to revaluation paid in Fiscal 2013	17,900,000	10,400,000	17,900,000	10,400,000
Taxes Payable, Due in Year Two	16,000,000		16,000,000
Taxes Payable, Due in Year Three	4,000,000		4,000,000
Cash Taxes, Tax Amortization Period			20 years
Total improvement to cash flow from operations related to revaluation	$ 95,000,000

[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.