Additional Financial Statement Information - (Schedule of Other Items in Operations) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Foreign exchange loss	$ (174)	$ (1,185)	$ 561	$ (285)
Interest income	20	109	65	176
Pension expense	(143)	(164)	(280)	(323)
Other	(29)	(33)	(99)	(158)
Other nonoperating income (expense)	$ (326)	$ (1,273)	$ 247	$ (590)

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
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-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of income (expense) related to nonoperating activities, classified as other.

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