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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. 26, 2015 | Sep. 26, 2015
Goodwill [Line Items] |  |  |
Goodwill | $ 1,108,601 |  | $ 1,093,891
Accumulated adjustments | (6,462) |  | (6,462)
Goodwill, net | 1,102,139 |  | 1,087,429
Goodwill acquired during fiscal 2016 | 14,710 | [1] | 0
Propane [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 1,089,801 |  | 1,075,091
Accumulated adjustments | 0 |  | 0
Goodwill, net | 1,089,801 |  | 1,075,091
Goodwill acquired during fiscal 2016 | 14,710 | [1] | 0
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
Natural Gas and Electricity [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 7,900 |  | 7,900
Accumulated adjustments | 0 |  | 0
Goodwill, net | $ 7,900 |  | $ 7,900
[1] | Increases reflect the Propane USA acquisition (Note 3)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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