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Post-Retirement Health Care (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Retirement Benefits [Abstract]
Service cost	$ 186	$ 184	$ 371	$ 369
Interest cost	206	211	412	422
Amortization of (gain)/loss	6	15	13	30
Net periodic benefit cost	$ 398	$ 410	$ 796	$ 821

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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