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

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 4

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318



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