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Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Dividends, Common Stock [Abstract]
Dividends per share declared	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared	$ 0.60us-gaap_CommonStockDividendsPerShareDeclared
Dividend payments	$ 207.4us-gaap_PaymentsOfDividends	$ 202.3us-gaap_PaymentsOfDividends	$ 0us-gaap_PaymentsOfDividends
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments	52.0us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	50.4us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Retained Earnings
Dividends, Common Stock [Abstract]
Dividend payments	$ 155.4us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 151.9us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Details

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X

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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