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Segment, Geographic, and Significant Customer Information (Schedule of Assets by Geographic Areas) (Details) (USD $)
In Millions
Apr. 29, 2011
Apr. 30, 2010
Segment, Geographic, and Significant Customer Information    
United States $ 840.2 $ 735.0
International 71.4 69.4
Total property and equipment $ 911.6 $ 804.4