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Derivative Financial Instruments and Fair Value Measurements (Embedded Derivative Narrative) (Details) - Enchi Corporation [Member] - USD ($) $ in Millions | Dec. 30, 2017 | Dec. 31, 2016 | Aug. 29, 2014 | Aug. 05, 2011
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Derivative [Line Items] |  |  |  |
Investment Owned At Cost |  |  | $ 0.9 | $ 0.5
Investment Embedded Accelerated Payment Option | $ 5.1 |  |  |
Embedded Derivative, Fair Value of Embedded Derivative, Net | $ 2.7 | $ 2.9 |  |

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- Definition Net fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as assets, net of those classified as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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