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Credit Facility (Details) - USD ($)		12 Months Ended
	May 09, 2016	Dec. 29, 2017	Dec. 30, 2016
Revolving line of credit facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under credit facility	$ 45,000,000	$ 20,000,000
Outstanding balance		$ 19,000,000	$ 7,000,000
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%
Interest rate		2.96%
Debt issuance costs		$ 300,000
Debt balance			$ 7,000,000
Amount drawn on loan		26,000,000
Payment of principal		$ 14,000,000
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%
Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt issuance costs		$ 200,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under credit facility		$ 47,000,000
Term of debt	5 years

X

- Definition

Debt instrument, additional borrowing capacity.

+ References

No definition available.

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- Definition

Pledge of capital stock to direct foreign subsidiaries.

+ References

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- Definition

Pledge of capital stock to U.S. subsidiaries.

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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))
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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.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

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- Definition

Fair value of the amount outstanding under the credit facility.

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

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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
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-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.

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