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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% |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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