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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	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014
Dividends, Common Stock [Abstract]
Dividends per share declared and paid	$ 0.165us-gaap_CommonStockDividendsPerShareDeclared	$ 0.150us-gaap_CommonStockDividendsPerShareDeclared	$ 0.495us-gaap_CommonStockDividendsPerShareDeclared	$ 0.450us-gaap_CommonStockDividendsPerShareDeclared
Dividend payments			$ 156.9us-gaap_PaymentsOfDividends	$ 153.1us-gaap_PaymentsOfDividends
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments			52.1us-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			$ 104.8us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 102.7us-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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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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- 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=31042434&loc=d3e3291-108585

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