Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

The maximum consolidated leverage ratio under the negative covenants of the credit facility.

+ References

No definition available.

+ Details

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- Definition

The minimum consolidated interest charge coverage ratio (calculated as income before interest and taxes, divided by interest) to be in compliance with the financial covenant under an existing debt agreement.

+ References

No definition available.

+ Details

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- Definition

The period over which the entity typically manages its level of exposure to the risk of currency-exchange fluctuations by hedging a portion of its currency exposures anticipated over the ensuing period.

+ References

No definition available.

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- Definition

The percentage of effectiveness of derivative instruments.

+ References

No definition available.

+ Details

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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://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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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Derivatives - Additional Information (Details)	12 Months Ended
Derivatives - Additional Information (Details)	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)	Jan. 16, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Amounts to be reclassified into earnings	$ 28,000
Revolving credit facility
Derivatives, Fair Value [Line Items]
Maximum consolidated leverage ratio	3.5
Minimum consolidated interest coverage ratio	3
Forward Currency-Exchange Contracts \| Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Loss on foreign currency derivative instruments, not designated as hedging	$ 1,367,000	$ 797,000	$ 386,000
Cash Flow Hedging \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Rate of effectiveness of derivative agreement	100.00%
Cash Flow Hedging \| Swap Agreement 2015 \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount				$ 10,000,000
Cash Flow Hedging \| Swap Agreement 2015 \| Derivatives Designated as Hedging Instruments \| LIBOR
Derivatives, Fair Value [Line Items]
Derivative, fixed interest rate				1.50%
Cash Flow Hedging \| Interest rate swap agreements \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Unrealized gain associated with swap agreements	$ 126,000
Cash Flow Hedging \| Forward Currency-Exchange Contracts \| Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Period over which entity manages its level of exposure of risk	12 months