Long-Term Obligations - Narrative (Details) - USD ($)	12 Months Ended
Dec. 30, 2017	Jun. 30, 2018
Debt Instrument [Line Items]
Weighted average interest rate for revolving credit facility (in hundredths)		2.97%
Loan receivable		$ 590,000
Capital lease obligations	$ 4,633,000	4,362,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding balance	$ 237,011,000	202,205,000
Remaining borrowing capacity		98,289,000
Revolving Credit Facility [Member] \| Canadian Denominated Borrowing [Member]
Debt Instrument [Line Items]
Outstanding balance		44,856,000
Revolving Credit Facility [Member] \| Euro-Denominated Borrowing [Member]
Debt Instrument [Line Items]
Outstanding balance		$ 40,349,000
Capital Lease Obligations [Member] \| Sale Leaseback Arrangement [Member]
Debt Instrument [Line Items]
Effective interest rate		1.79%
Net purchase option		$ 1,550,000
Capital lease obligations		4,282,000
Capital Lease Obligations [Member] \| Other Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations		$ 80,000
Revolving Credit Facility [Member] \| 2017 Credit Agreement [Member]
Debt Instrument [Line Items]
Term of unsecured revolving credit facility	5 years
Borrowing capacity available under committed portion	$ 300,000,000
Additional borrowing capacity	$ 100,000,000
Basis spread on variable rate floor (as a percentage)	0.00%
Percentage of foreign unrestricted cash	65.00%
Maximum unrestricted cash	$ 30,000,000
Maximum consolidated leverage ratio	3.5
Minimum consolidated interest coverage ratio	3
Revolving Credit Facility [Member] \| 2017 Credit Agreement [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	0.50%
Revolving Credit Facility [Member] \| 2017 Credit Agreement [Member] \| Thirty-day LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	0.50%
Revolving Credit Facility [Member] \| 2017 Credit Agreement [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	1.00%
Revolving Credit Facility [Member] \| 2017 Credit Agreement [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate (in hundredths)	2.00%

Debt Instrument, Basis Spread on Variable Rate, Floor

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- Definition

Debt Instrument, Net Purchase Option

+ References

No definition available.

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- Definition

Debt Instrument, Variable Rate Consideration, Foreign Unrestricted Cash

+ References

No definition available.

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- Definition

Debt Instrument, Variable Rate Consideration, Percentage of Foreign Unrestricted Cash

+ References

No definition available.

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- Definition

The additional amount available over and above the maximum borrowing capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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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.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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- Definition

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

+ References

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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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.

+ References

No definition available.

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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

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

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

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