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Schedule of Cash, Cash Equivalents, Short-Term Investments and Restricted Cash and Investments Unrealized Loss Positions (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 28, 2014
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Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | $ 1,290,476 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (4,318)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Unrealized Losses 12 Months or Greater - Fair Value | 24,727 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss | (391)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Total - Fair Value | 1,315,203 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Total - Gross Unrealized Loss | (4,709)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Municipal Notes And Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 49,621 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (54)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Total - Fair Value | 49,621 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Total - Gross Unrealized Loss | (54)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Corporate Notes And Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 856,576 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (3,207)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Unrealized Losses 12 Months or Greater - Fair Value | 3,279 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss | (29)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Total - Fair Value | 859,855 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Total - Gross Unrealized Loss | (3,236)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
US Treasury and Agencies |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 201,166 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryAndGovernmentMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (361)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryAndGovernmentMember
Total - Fair Value | 201,166 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryAndGovernmentMember
Total - Gross Unrealized Loss | (361)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasuryAndGovernmentMember
Government-Sponsored Enterprises |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 42,900 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (84)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total - Fair Value | 42,900 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total - Gross Unrealized Loss | (84)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Foreign Government Bonds |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 34,934 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (154)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Total - Fair Value | 34,934 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Total - Gross Unrealized Loss | (154)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Mortgage Backed Securities - Residential |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 459 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Unrealized Losses 12 Months or Greater - Fair Value | 4,094 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss | (103)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total - Fair Value | 4,553 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Total - Gross Unrealized Loss | (103)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Mortgage Backed Securities - Commercial |
Schedule of Available-for-sale Securities [Line Items] |
Unrealized Losses Less Than 12 Months - Fair Value | 104,820 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss | (458)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Unrealized Losses 12 Months or Greater - Fair Value | 17,354 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss | (259)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Total - Fair Value | 122,174 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Total - Gross Unrealized Loss | $ (717)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember

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