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Financial Instruments and Fair Value Measurements - Schedule of Gross Unrealized Losses and Estimated Fair Values of Investments (Detail) (USD $) In Millions, unless otherwise specified | Apr. 25, 2014
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Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months estimated fair value | $ 296.1 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Less than 12 months, unrealized loss | (0.6)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
12 months or greater estimated fair value | 36.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
12 months or greater, unrealized loss | (0.9)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Estimated fair value, total | 332.1 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized loss, total | (1.5)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Corporate Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months estimated fair value | 233.1 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Less than 12 months, unrealized loss | (0.5)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
12 months or greater estimated fair value | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
12 months or greater, unrealized loss | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Estimated fair value, total | 233.1 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Unrealized loss, total | (0.5)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
U.S. Treasury and Government Debt Securities |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months estimated fair value | 63.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Less than 12 months, unrealized loss | (0.1)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
12 months or greater estimated fair value | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
12 months or greater, unrealized loss | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Estimated fair value, total | 63.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Unrealized loss, total | (0.1)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Auction Rate Securities |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months estimated fair value | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Less than 12 months, unrealized loss | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
12 months or greater estimated fair value | 36.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
12 months or greater, unrealized loss | (0.9)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Estimated fair value, total | 36.0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Unrealized loss, total | $ (0.9)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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