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Balance Sheet Details - Cash and Cash Equivalents (Detail) (USD $) In Millions, unless otherwise specified	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Cash And Cash Equivalents [Abstract]
Cash	$ 1,666.3us-gaap_Cash	$ 2,174.0us-gaap_Cash
Cash equivalents	255.2us-gaap_CashEquivalentsAtCarryingValue	117.0us-gaap_CashEquivalentsAtCarryingValue
Cash and cash equivalents	$ 1,921.5	$ 2,291.0	$ 3,277.1	$ 1,549.8

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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