Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 173	$ (493)
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,971	(509)
Amortization of defined benefit pension items:
Net actuarial loss	16	32
Prior service cost	12	12
Defined benefit pension plan adjustments	28	44
Other comprehensive (loss) income, net of tax	(1,943)	553
Comprehensive (loss) income	$ (1,770)	$ 60

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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