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Balance Sheet Details - Other Current Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 23, 2015
Apr. 25, 2014
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Prepaid expenses and other current assets $ 266.0us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 219.4us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets 252.0us-gaap_DeferredTaxAssetsNetCurrent 270.3us-gaap_DeferredTaxAssetsNetCurrent
Other current assets $ 518.0us-gaap_OtherAssetsCurrent $ 489.7us-gaap_OtherAssetsCurrent