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Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 27, 2021 | Sep. 26, 2020
Goodwill [Line Items] |  |  |
Goodwill |  | $ 1,113,488 | $ 1,110,243
Accumulated adjustments |  | (6,462) | (6,462)
Goodwill, net |  | 1,107,026 | 1,103,781
Goodwill acquired | [1] | 3,245 |
Propane [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 1,094,688 | 1,091,443
Accumulated adjustments |  | 0 | 0
Goodwill, net |  | 1,094,688 | 1,091,443
Goodwill acquired | [1] | 3,245 |
Fuel Oil and Refined Fuels [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 10,900 | 10,900
Accumulated adjustments |  | (6,462) | (6,462)
Goodwill, net |  | 4,438 | 4,438
Goodwill acquired | [1] | 0 |
Natural Gas and Electricity [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 7,900 | 7,900
Accumulated adjustments |  | 0 | 0
Goodwill, net |  | 7,900 | $ 7,900
Goodwill acquired | [1] | $ 0 |
[1] | Reflects the impact from acquisitions (See Note 4).

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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