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General - Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2019	Jun. 28, 2018	Jun. 27, 2019	Jun. 28, 2018
General
Service cost	$ 209	$ 231	$ 418	$ 463
Interest cost	371	341	742	682
Net amortization of prior service cost and actuarial loss	109	155	218	310
Net periodic pension cost	$ 689	$ 727	$ 1,378	$ 1,455

X

- Definition

The amount of the prior service cost in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation and actuarial losses.

+ References

No definition available.

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- References

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X

- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

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-Publisher FASB
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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

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- Definition

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

+ References

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