Income Taxes (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010	Apr. 24, 2009
Operating Loss Carryforwards [Line Items]
Deferred tax assets, increase in valuation allowance	$ 13.1	$ 17.2
Valuation allowance attributable to foreign tax credit carryforwards	7.1
Unrecognized tax benefits	161.0	133.3	134.5	110.1
Unrecognized accrued interest and penalties	0.6	0.2	0.6
Unrecognized accrued interest and penalties	1.6	1.0
Unrecognized tax benefits included in other long-term liabilities	106.0
Unrecognized tax benefits that would affect provision for income taxes	93.9
Increase in unrecognized tax benefits related to prior years as a result of the settlement and remeasurement	7.3
Settlement of 2003-2004 IRS examination - net benefit recognized	21.1
Tax benefit from holiday	6.3	3.1
Tax benefit effect on per share earnings	$ 0.02	$ 0.01
Accumulated unremitted earnings from foreign subsidiaries	1,844
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	196.8
Tax credit carryforward amount	115.4
Federal Tax [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	354.1
Tax credit carryforward amount	128.1
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates	2013
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates	2032
Additional Paid-in Capital [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 227.7