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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%

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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