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Employee Benefit Plans Amounts in Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost in Next Year (Details) $ in Thousands | 12 Months Ended
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Dec. 26, 2015 USD ($)
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of net actuarial loss | $ 1,931
Amortization of net prior service credit | (576)
Other Post-Retirement Benefit Plans |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of net actuarial loss | 251
Amortization of net prior service credit | $ 0

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