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Business Segments (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 USD ($) segment | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Business Segments | segment |  | 3 |  |
Capital expenditures: | [1] | $ 359,498 | $ 321,896 | $ 274,168
Fuel Ingredients [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures: |  | $ 23,964 | $ 27,121 | $ 24,707
[1] | Excludes capital assets acquired by acquisition in fiscal 2018 of approximately $31.6 million and excludes immaterial capital assets acquired by acquisition in fiscal 2017.

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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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. + Details
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