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Segment Geographic and Significant Customer Information - Schedule of Property and Equipment Net by Geographic Areas (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 25, 2013
Apr. 27, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Property and equipment $ 1,189.2 $ 1,137.2
United States
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Property and equipment 1,093.7 1,038.9
International
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Property and equipment $ 95.5 $ 98.3