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Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 25, 2017 | Mar. 31, 2018 | Mar. 25, 2017 | Sep. 30, 2017
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | $ 536,282 | $ 450,578 | $ 909,559 | $ 767,885 |
Operating income (loss): |  |  |  |  |  |
Total operating income |  | 126,230 | 102,857 | 181,978 | 156,342 |
Reconciliation to net income: |  |  |  |  |  |
Loss on debt extinguishment |  | 0 | 1,567 | 0 | 1,567 |
Interest expense, net |  | 19,402 | 17,487 | 38,916 | 36,318 |
Provision for (benefit from) income taxes |  | 41 | (9) | (893) | 156 |
Net income |  | 106,787 | 83,812 | 143,955 | 118,301 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 32,203 | 32,670 | 63,334 | 63,931 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 2,227,981 |  | 2,227,981 |  | $ 2,171,283
Operating/Reportable Segments [Member] | Propane [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 462,814 | 385,654 | 784,944 | 655,113 |
Operating income (loss): |  |  |  |  |  |
Total operating income | [1] | 143,221 | 115,346 | 217,772 | 190,009 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 28,288 | 28,072 | 56,069 | 55,456 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 2,093,843 |  | 2,093,843 |  | 2,066,997
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 41,699 | 34,630 | 67,014 | 56,726 |
Operating income (loss): |  |  |  |  |  |
Total operating income |  | 7,199 | 6,828 | 11,023 | 9,676 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 716 | 667 | 1,295 | 1,298 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 58,291 |  | 58,291 |  | 49,863
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 20,392 | 19,239 | 33,539 | 32,306 |
Operating income (loss): |  |  |  |  |  |
Total operating income |  | 5,454 | 5,535 | 8,939 | 8,655 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 0 | 0 | 0 | 0 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 17,053 |  | 17,053 |  | 12,455
Operating/Reportable Segments [Member] | All Other [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 11,377 | 11,055 | 24,062 | 23,740 |
Operating income (loss): |  |  |  |  |  |
Total operating income |  | (4,981) | (5,186) | (10,214) | (10,392) |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 56 | 76 | 106 | 146 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 3,228 |  | 3,228 |  | 2,147
Operating/Reportable Segments [Member] | Corporate [Member] |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |
Total operating income |  | (24,663) | (19,666) | (45,542) | (41,606) |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 3,143 | $ 3,855 | 5,864 | $ 7,031 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | $ 55,566 |  | $ 55,566 |  | $ 39,821
[1] | Includes the loss on sale of business of $4,823 for the six months ended March 31, 2018 (see Note 3).

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