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Income Taxes (Current and Noncurrent Net Deferred Tax Assets) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 27, 2012
Apr. 29, 2011
Income Taxes [Abstract]    
Current deferred tax assets, net $ 201.6 $ 145.7
Non-current deferred tax assets, net $ 203.8 $ 208.0