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Disclosures About Defined Pension Benefit Obligations (Schedule of Pension Plans' Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Mar. 27, 2015
Mar. 28, 2014
Component:        
Service cost $ 8,261us-gaap_DefinedBenefitPlanServiceCost $ 10,459us-gaap_DefinedBenefitPlanServiceCost $ 16,836us-gaap_DefinedBenefitPlanServiceCost $ 20,872us-gaap_DefinedBenefitPlanServiceCost
Interest cost 16,103us-gaap_DefinedBenefitPlanInterestCost 20,059us-gaap_DefinedBenefitPlanInterestCost 32,761us-gaap_DefinedBenefitPlanInterestCost 39,952us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (20,365)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (22,500)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (41,415)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (44,840)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of previously unrecognized items 5,108us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 4,872us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 10,436us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 9,675us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Settlement Loss 15us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 141us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 159us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 280us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Net periodic benefit cost $ 9,122us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 13,031us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 18,777us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 25,939us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost