v2.4.1.9
Marketable Securities (Classified as Available-For-Sale Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 28, 2015
Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,536,457us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 1,594,764us-gaap_AvailableForSaleSecuritiesAmortizedCost [1]
Gross Unrealized Gains 2,942us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 2,020us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains [1]
Gross Unrealized Losses-OTTI (6,027)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities [2] (13,031)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities [1],[2]
Gross Unrealized Losses-Other (4,058)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments [3] (8,420)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments [1],[3]
Estimated Fair Value (Net Carrying Amount) 1,529,314us-gaap_AvailableForSaleSecurities 1,575,333us-gaap_AvailableForSaleSecurities [1]
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 27,185us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
30,185us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[1]
Gross Unrealized Gains 186us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
26us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[1]
Gross Unrealized Losses-OTTI 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[2] (25)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[1],[2]
Gross Unrealized Losses-Other (2)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[3] (42)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) 27,369us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
30,144us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
[1]
Agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 330,109us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
436,817us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[1]
Gross Unrealized Gains 531us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
169us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[1]
Gross Unrealized Losses-OTTI (3,242)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[2] (8,259)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[1],[2]
Gross Unrealized Losses-Other (238)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[3] (407)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) 327,160us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
428,320us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
[1]
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 382,676us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
329,048us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[1]
Gross Unrealized Gains 953us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
580us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[1]
Gross Unrealized Losses-OTTI (1,076)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[2] (1,813)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[1],[2]
Gross Unrealized Losses-Other (2,018)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[3] (3,508)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) 380,535us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
324,307us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MortgageBackedSecuritiesMember
[1]
Corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 574,513us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
600,674us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[1]
Gross Unrealized Gains 744us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
689us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[1]
Gross Unrealized Losses-OTTI (1,690)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[2] (2,874)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[1],[2]
Gross Unrealized Losses-Other (1,356)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[3] (4,087)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) 572,211us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
594,402us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateDebtSecuritiesMember
[1]
Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 153,513us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
125,183us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[1]
Gross Unrealized Gains 515us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
497us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[1]
Gross Unrealized Losses-OTTI (5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[2] (48)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[1],[2]
Gross Unrealized Losses-Other (406)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[3] (222)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) 153,617us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
125,410us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
[1]
Other    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 68,461us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
72,857us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[1]
Gross Unrealized Gains 13us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
59us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[1]
Gross Unrealized Losses-OTTI (14)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[2] (12)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[1],[2]
Gross Unrealized Losses-Other (38)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[3] (154)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[1],[3]
Estimated Fair Value (Net Carrying Amount) $ 68,422us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
$ 72,750us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherDebtSecuritiesMember
[1]
[1] Certain available-for-sale securities held as of December 27, 2014 have been reclassified among major security types to conform to the current year presentation. These reclassifications had no effect on fair value measurement.
[2] Represents impairment not related to credit for those investment securities that have been determined to be other-than-temporarily impaired.
[3] Represents unrealized losses on investment securities that have not been determined to be other-than-temporarily impaired.