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Balance Sheet Details - Cash and Cash Equivalents (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 25, 2014
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Cash and Cash Equivalents [Line Items]        
Cash $ 2,174.0 $ 1,634.7    
Cash equivalents 117.0 1,642.4    
Cash and cash equivalents $ 2,291.0 $ 3,277.1 $ 1,549.8 $ 2,757.3