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Segment Information - Reconciliation of Partnership EBITDA to AmeriGas Propane Operating Income and Footnotes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Reconciliation of partnership EBITDA |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | $ (455,100,000) | $ (416,300,000) | $ (400,900,000)
Interest expense |  |  |  |  | (230,100,000) | (223,500,000) | (228,900,000)
Impairment of Partnership tradenames and trademarks | $ (75,000,000) |  |  |  | (75,000,000) | 0 | 0
Loss on extinguishments of debt |  | $ (700,000) | $ (3,600,000) | $ (5,300,000) | 0 | (59,700,000) | (48,900,000)
Income before income taxes |  |  |  |  | $ 854,500,000 | $ 701,400,000 | $ 710,000,000
General Partner interest in AmeriGas OLP (percentage) |  |  |  |  | 1.01% | 1.01% | 1.01%
Pretax gains (losses) on unsettled commodity derivative instruments |  |  |  |  | $ 132,800,000 | $ 82,000,000 | $ 91,600,000
Other-than-temporary impairment of an investment in a private equity partnership pre-tax loss |  |  |  |  | 0 | 11,000,000 | 0
AmeriGas Propane |  |  |  |  |  |  |
Reconciliation of partnership EBITDA |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  | (48,900,000)
Operating Segments | AmeriGas Propane |  |  |  |  |  |  |
Reconciliation of partnership EBITDA |  |  |  |  |  |  |
Partnership Adjusted EBITDA |  |  |  |  | 605,500,000 | 551,300,000 | 543,000,000
Depreciation and amortization |  |  |  |  | (185,800,000) | (190,500,000) | (190,000,000)
Interest expense |  |  |  |  | (163,100,000) | (160,200,000) | (164,100,000)
Impairment of Partnership tradenames and trademarks |  |  |  |  | (75,000,000) | 0 | 0
Loss on extinguishments of debt |  |  |  |  | 0 | (59,700,000) | (48,900,000)
MGP environmental accrual |  |  |  |  | 0 | (7,500,000) | 0
Noncontrolling interests |  |  |  |  | 2,500,000 | 2,000,000 | 3,300,000
Income before income taxes |  |  |  |  | $ 184,100,000 | $ 135,400,000 | $ 143,300,000

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- Definition Gains (Losses) On Unsettled Commodity Derivative Instruments, Net + References No definition available. + Details
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- Definition Limited liability company LLC or limited partnership LP managing member or general partner ownership interest percentage. + References No definition available. + Details
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- Definition Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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