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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
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses Less Than 12 Months - Fair Value	$ 1,290,476us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Unrealized Losses Less Than 12 Months - Gross Unrealized Loss	(4,318)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Unrealized Losses 12 Months or Greater - Fair Value	24,727us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Unrealized Losses 12 Months or Greater - Gross Unrealized Loss	(391)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Total - Fair Value	1,315,203us-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	49,621us-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	49,621us-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	856,576us-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	3,279us-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	859,855us-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	201,166us-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	201,166us-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	42,900us-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	42,900us-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	34,934us-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	34,934us-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	459us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Unrealized Losses 12 Months or Greater - Fair Value	4,094us-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	4,553us-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	104,820us-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	17,354us-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	122,174us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Total - Gross Unrealized Loss	$ (717)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember

X

- 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.

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