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Leases - Balance Sheet Classification of Lease Liabilities (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 30, 2017 | Dec. 29, 2017
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Operating lease liabilities: |  |  |  |
Current portion included in Other current liabilities |  | $ 2,315 |  |
Long-term portion of lease liabilities |  | 12,529 |  |
Total operating lease liabilities |  | 14,844 |  |
Financing lease liabilities: |  |  |  |
Current portion included in Other current liabilities |  | 49 |  |
Long-term portion of lease liabilities |  | 90 |  |
Financing obligation for build-to-suit lease |  | 139 |  |
Total lease liabilities |  | $ 14,983 | $ 13,324 |
Financing obligation for build-to-suit lease | [1] |  |  | $ 14,530
[1] | The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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