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Financial Instruments and Risk Management - Effect of the Partnership's Derivative Instruments on the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Commodity-Related Derivatives [Member] | Cost of Products Sold [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Unrealized Gains (Losses) Recognized in Income | $ 138 | $ 3,806 | $ (7,252) | $ (1,421)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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