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Business Segments (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 USD ($) segment | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Business Segments | segment |  | 3 |  |  |  |  |  |  |  |  | 3 |  |
Net Sales |  | $ 952,549 | $ 936,262 | $ 894,930 | $ 878,510 | $ 885,758 | $ 852,018 | $ 875,777 | $ 778,375 |  | $ 3,662,251 | $ 3,391,928 | $ 3,391,255
Capital expenditures: | [1] |  |  |  |  |  |  |  |  |  | 274,168 | 243,523 | 229,848
Fuel Ingredients [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  |  |  | 265,783 | 247,058 | 228,195
Capital expenditures: |  |  |  |  |  |  |  |  |  |  | $ 24,707 | $ 22,323 | $ 19,478
Scenario, Forecast [Member] | Fuel Ingredients [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Credits and Adjustments |  |  |  |  |  |  |  |  |  | $ 12,600 |  |  |
[1] | Excludes immaterial capital assets acquired by acquisition in fiscal 2017, fiscal 2016 and fiscal 2015.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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