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Derivatives - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Designated as Hedging Instrument | Forward currency-exchange contracts | Other Current Assets
Derivatives in an Asset Position:
Derivatives in an asset position	$ 4	$ 0
Notional amount, Derivative asset	1,311	0
Designated as Hedging Instrument | Forward currency-exchange contracts | Other Current Liabilities
Derivatives in a Liability Position:
Derivatives in a liability position	(14)	(75)
Notional amount, Derivative liability	842	4,825
Designated as Hedging Instrument | 2015 Swap Agreement | Other Current Assets
Derivatives in an Asset Position:
Derivatives in an asset position	0	11
Notional amount, Derivative asset	0	10,000
Designated as Hedging Instrument | 2018 Swap Agreement | Other Long-Term Liabilities
Derivatives in a Liability Position:
Derivatives in a liability position	(1,202)	(770)
Notional amount, Derivative liability	15,000	15,000
Not Designated as Hedging Instrument | Forward currency-exchange contracts | Other Current Assets
Derivatives in an Asset Position:
Derivatives in an asset position	25	3
Notional amount, Derivative asset	713	387
Not Designated as Hedging Instrument | Forward currency-exchange contracts | Other Current Liabilities
Derivatives in a Liability Position:
Derivatives in a liability position	(5)	(43)
Notional amount, Derivative liability	$ 686	$ 2,545

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Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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-Topic 210
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Nominal or face amount used to calculate payments on the derivative liability.

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