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Balance Sheet Details - Other Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Jan. 23, 2015	Apr. 25, 2014
Other Assets Noncurrent Disclosure [Abstract]
Auction rate securities	$ 0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	$ 36.0us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
Deferred tax assets	250.6us-gaap_DeferredTaxAssetsNetNoncurrent	245.0us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	242.5us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent	248.5us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent
Other non-current assets	$ 493.1us-gaap_OtherAssetsNoncurrent	$ 529.5us-gaap_OtherAssetsNoncurrent

X

- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Section 45

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X

- Definition

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 4

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



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X

- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer.

+ References

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