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Stockholders' Equity - Schedule of Employee Stock Purchase Plan ESPP (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Jan. 23, 2015 | Jan. 24, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under the ESPP | 3.4 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 3.8 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Proceeds from issuance of shares | 97.1 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | 95.5 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember

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- Definition The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
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- Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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