Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Revenues [Abstract]
Total revenues	$ 1,267,705	$ 1,344,413	$ 1,187,886
Operating income (loss):
Total operating income	150,854	158,003	128,595
Reconciliation to net income:
Loss on debt extinguishment	0	0	1,567
Interest expense, net	76,663	77,383	75,263
Other, net	4,702	4,692	13,311
Provision for (benefit from) income taxes	857	(606)	459
Net income	68,632	76,534	37,995
Depreciation and amortization [Abstract]
Total depreciation and amortization	120,872	125,222	127,938
Assets [Abstract]
Total assets	1,998,348	2,101,199
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	1,083,446	1,153,323	1,011,078
Operating income (loss):
Total operating income	254,447	248,473	218,346
Depreciation and amortization [Abstract]
Total depreciation and amortization	108,763	111,460	111,374
Assets [Abstract]
Total assets	1,904,344	1,995,060
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	92,084	91,520	78,126
Operating income (loss):
Total operating income	8,489	7,605	8,552
Depreciation and amortization [Abstract]
Total depreciation and amortization	2,083	2,574	2,610
Assets [Abstract]
Total assets	44,279	47,911
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	45,206	54,308	55,103
Operating income (loss):
Total operating income	8,758	12,309	13,826
Depreciation and amortization [Abstract]
Total depreciation and amortization	0	0	0
Assets [Abstract]
Total assets	11,907	13,067
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	46,969	45,262	43,579
Operating income (loss):
Total operating income	(19,516)	(20,145)	(23,017)
Depreciation and amortization [Abstract]
Total depreciation and amortization	196	215	283
Assets [Abstract]
Total assets	2,950	3,363
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(101,324)	(90,239)	(89,112)
Depreciation and amortization [Abstract]
Total depreciation and amortization	9,830	10,973	$ 13,671
Assets [Abstract]
Total assets	$ 34,868	$ 41,798