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Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Sep. 28, 2019
Goodwill [Line Items] |  |  |
Goodwill |  | $ 1,110,243 | $ 1,104,547
Accumulated adjustments |  | (6,462) | (6,462)
Goodwill, net |  | 1,103,781 | 1,098,085
Goodwill acquired | [1] | 5,696 |
Propane [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | 1,091,443 | 1,085,747
Accumulated adjustments |  | 0 | 0
Goodwill, net |  | 1,091,443 | 1,085,747
Goodwill acquired | [1] | 5,696 |
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, “Acquisitions of Businesses”).

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