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Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 24, 2017 | Jun. 30, 2018 | Jun. 24, 2017 | Sep. 30, 2017
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | $ 241,936 | $ 222,895 | $ 1,151,495 | $ 990,780 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  | 3,061 | (11,062) | 185,039 | 145,280 |
Reconciliation to net (loss) income: |  |  |  |  |  |
Loss on debt extinguishment |  | 0 | 0 | 0 | 1,567 |
Interest expense, net |  | 19,512 | 18,502 | 58,428 | 54,820 |
Provision for (benefit from) income taxes |  | 144 | 152 | (749) | 308 |
Net (loss) income |  | (16,595) | (29,716) | 127,360 | 88,585 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 31,259 | 31,825 | 94,593 | 95,756 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 2,131,533 |  | 2,131,533 |  | $ 2,171,283
Operating/Reportable Segments [Member] | Propane [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 205,400 | 188,406 | 990,344 | 843,519 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) | [1] | 28,073 | 11,323 | 245,845 | 201,332 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 27,875 | 27,787 | 83,944 | 83,243 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 2,020,928 |  | 2,020,928 |  | 2,066,997
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 15,400 | 12,886 | 82,414 | 69,612 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  | (891) | 199 | 10,132 | 9,875 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 571 | 625 | 1,866 | 1,923 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 49,525 |  | 49,525 |  | 49,863
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 10,403 | 11,923 | 43,942 | 44,229 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  | 2,192 | 2,806 | 11,131 | 11,461 |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 0 | 0 | 0 | 0 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 12,679 |  | 12,679 |  | 12,455
Operating/Reportable Segments [Member] | All Other [Member] |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |
Total revenues |  | 10,733 | 9,680 | 34,795 | 33,420 |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  | (4,607) | (5,747) | (14,821) | (16,139) |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 57 | 76 | 163 | 222 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | 3,576 |  | 3,576 |  | 2,147
Operating/Reportable Segments [Member] | Corporate [Member] |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |
Total operating income (loss) |  | (21,706) | (19,643) | (67,248) | (61,249) |
Depreciation and amortization [Abstract] |  |  |  |  |  |
Total depreciation and amortization |  | 2,756 | $ 3,337 | 8,620 | $ 10,368 |
Assets [Abstract] |  |  |  |  |  |
Total assets |  | $ 44,825 |  | $ 44,825 |  | $ 39,821
[1] | Includes the loss on sale of business of $4,823 for the nine months ended June 30, 2018 (see Note 3).

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