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Commitments and Contingencies (Foreign Currency Contracts) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)
Foreign Currency Cash Flow Hedges [Abstract]
Increase (decrease) in sales	$ (141)	$ 163	$ (2)	$ 139
Increase (decrease) in cost of sales	(159)	(179)	(595)	883
Ineffective portion of change in fair value	0	$ 0	0	$ 0
Foreign Currency Cash Flow Hedge [Line Items]
Foreign currency cash flow hedge gain (loss) to be reclassified	700		700
FX Contract 1 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Aggregate Notional Amount	3,000		$ 3,000
Start Date			Jul. 02, 2018
End Date			Dec. 28, 2018
FX Contract 2 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Aggregate Notional Amount	15,199		$ 15,199
Start Date			Jan. 01, 2018
End Date			Dec. 28, 2018
FX Contract 3 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Aggregate Notional Amount	12,300		$ 12,300
Start Date			Jan. 01, 2018
End Date			Dec. 28, 2018
Accrued Expenses [Member] | FX Contract 1 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	(16)		$ (16)
Accrued Expenses [Member] | FX Contract 2 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	(313)		(313)
Accrued Expenses [Member] | FX Contract 3 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ (333)		$ (333)
Peso [Member] | FX Contract 1 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
$/Foreign Currency	0.0500		0.0500
Peso [Member] | FX Contract 2 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
$/Foreign Currency	0.0507		0.0507
Euro [Member] | FX Contract 3 [Member]
Foreign Currency Cash Flow Hedge [Line Items]
$/Foreign Currency	1.2059		1.2059

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Foreign Currency Cash Flow Hedge [Line Items]

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Increase (Decrease) In Foreign Currency Contract Sales

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Increase (reduction) in cost of sales from foreign currency forward contracts

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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Contractual rate at which a foreign currency can be purchased or sold.

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Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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The net gain (loss) relating to components of the gain (loss) on foreign currency cash flow hedging instruments excluded from the assessment of hedge effectiveness. Recognized in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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