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Balance Sheet Details - Cash and Cash Equivalents (Detail) (USD $)
In Millions, unless otherwise specified
Oct. 24, 2014
Apr. 25, 2014
Oct. 25, 2013
Apr. 26, 2013
Cash and Cash Equivalents [Line Items]        
Cash $ 2,680.3 $ 2,174.0    
Cash equivalents 224.9 117.0    
Cash and cash equivalents $ 2,905.2 $ 2,291.0 $ 2,260.5 $ 3,277.1