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Commitments And Contingencies (Schedule Of Product Warranty) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 27, 2012
Jan. 28, 2011
Jan. 27, 2012
Jan. 28, 2011
Commitments And Contingencies [Abstract]        
Beginning balance $ 65.0 $ 33.5 $ 40.5 $ 31.9
Liability assumed in acquisition 0 0 17.5 0
Expense accrued during the period 14.1 8.0 41.5 20.9
Warranty costs incurred (10.9) (5.8) (31.3) (17.1)
Ending Balance $ 68.2 $ 35.7 $ 68.2 $ 35.7