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Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 143 Months Ended
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Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013 | Apr. 24, 2015
Equity [Abstract] |  |  |  |
Number of shares repurchased | 29.6 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 47.3 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 18.1 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 214.0 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Average price per share | $ 39.30 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 39.78 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 32.68 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 33.48 us-gaap_TreasuryStockAcquiredAverageCostPerShare
Aggregate purchase price | $ 1,165.2 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 1,881.5 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 590.0 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |
Remaining authorization at end of period | $ 2,459.5 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 1,124.8 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 1,406.3 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | $ 2,459.5 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Definition Number of shares that have been repurchased and retired during the period. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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