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Derivatives - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018 | Jan. 02, 2016
Forward Currency-Exchange Contracts [Abstract] |  |  |  |  |  |
Recognized gains (losses) | $ 5,000 | $ 14,000 | $ (32,000) | $ 27,000 |  |
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 Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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- References No definition available. + 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=109980867&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=109980867&loc=SL5624171-113959 + Details
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- References No definition available. + Details
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