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Derivatives - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	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%

X

- 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

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- Definition

Derivative Instruments, Effective Portion of Cash Flow Hedge, Percentage

+ References

No definition available.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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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

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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

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-Topic 815
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