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Derivatives - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 29, 2018	Jan. 02, 2016
Forward Currency-Exchange Contracts [Abstract]
Recognized gains (losses)	$ 27,000	$ (14,000)	$ (1,000)	$ (46,000)
Net unrealized losses included in AOCI expected to be reclassified to earnings over the next 12 months			$ 351,000
Cash Flow Hedging | Designated as Hedging Instrument | 2018 Swap Agreement
Interest Rate Swaps [Abstract]
Derivative, notional amount					$ 15,000,000
Fixed rate of interest (in hundredths)					3.15%
Cash Flow Hedging | Designated as Hedging Instrument | 2015 Swap Agreement
Interest Rate Swaps [Abstract]
Derivative, notional amount						$ 10,000,000
Fixed rate of interest (in hundredths)						1.50%

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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