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Balance Sheet Details - Cash and Cash Equivalents (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 23, 2015
Apr. 25, 2014
Jan. 24, 2014
Apr. 26, 2013
Cash And Cash Equivalents [Abstract]        
Cash $ 2,266.7us-gaap_Cash $ 2,174.0us-gaap_Cash    
Cash equivalents 273.0us-gaap_CashEquivalentsAtCarryingValue 117.0us-gaap_CashEquivalentsAtCarryingValue    
Cash and cash equivalents $ 2,539.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,291.0us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,152.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,277.1us-gaap_CashAndCashEquivalentsAtCarryingValue