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Income Taxes - Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified | Apr. 24, 2015 | Apr. 25, 2014
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Current deferred tax assets, net | $ 251.7 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | $ 269.3 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax assets, net | $ 255.9 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | $ 245.0 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent

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