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Derivatives - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018 | Jan. 02, 2016
Forward Currency-Exchange Contracts [Abstract] |  |  |  |  |  |
Recognized gains (losses) | $ (14,000) | $ (67,000) | $ (46,000) | $ (40,000) |  |
Interest rate swap agreements |  |  |  |  |  |
Interest Rate Swaps [Abstract] |  |  |  |  |  |
Effective portion of cash flow hedge, percentage |  |  |  |  | 100.00% |
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%
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% |
LIBOR | Cash Flow Hedging | Designated as Hedging Instrument | 2018 Swap Agreement |  |  |  |  |  |
Interest Rate Swaps [Abstract] |  |  |  |  |  |
Interest rate floor |  |  |  |  | 0.00% |

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- Definition Derivative Instruments, Effective Portion of Cash Flow Hedge, Percentage + References No definition available. + 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 Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract. + 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=109980867&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=109980867&loc=SL5579245-113959 + Details
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