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Retirement Plans (Estimated future benefit payments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Retirement Plans [Abstract]  
2015 $ 51us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2016 1,929us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2017 1,929us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2018 1,929us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2019 1,929us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
2020 - 2024 $ 9,643us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter