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Credit Facility (Details) - USD ($)	3 Months Ended
	Mar. 30, 2018	May 09, 2016
Revolving line of credit facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under credit facility	$ 20,000,000	$ 45,000,000
Additional borrowing capacity		$ 25,000,000
Maturity date	May 09, 2021
Pledge of capital stock to U.S. subsidiaries	100.00%
Pledge of capital stock to direct foreign subsidiaries	66.00%
Additional amount drawn on loan	$ 0
Payment of principal	0
Outstanding balance	$ 19,000,000
Interest rate	3.20%
Revolving line of credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Margin percentage base rate	1.50%
Revolving line of credit facility [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Margin percentage base rate	0.75%
Term Loan [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under credit facility	$ 47,000,000
Term of debt	5 years

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- Definition

Debt instrument, additional borrowing capacity.

+ References

No definition available.

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- Definition

Pledge of capital stock to direct foreign subsidiaries.

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- Definition

Pledge of capital stock to U.S. subsidiaries.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of the total principal payments made during the annual reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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-Name Accounting Standards Codification
-Topic 210
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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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