Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Revenues [Abstract]
Total revenues	$ 206,906	$ 214,212	$ 941,839	$ 1,095,693
Operating income (loss):
Total operating income (loss)	4,880	(8,784)	162,359	181,840
Reconciliation to net (loss) income:
Loss on debt extinguishment	0	0	109	0
Interest expense, net	18,474	18,906	56,722	58,041
Other, net	1,878	1,176	3,835	3,527
(Benefit from) provision for income taxes	106	175	(253)	578
Net (loss) income	(15,578)	(29,041)	101,946	119,694
Depreciation and amortization [Abstract]
Total depreciation and amortization	29,153	30,151	87,715	90,845
Assets [Abstract]
Total assets	2,074,968		2,074,968		$ 1,998,348
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	179,049	183,052	812,160	937,468
Operating income (loss):
Total operating income (loss)	32,074	21,038	233,339	254,159
Depreciation and amortization [Abstract]
Total depreciation and amortization	26,724	26,828	80,575	81,722
Assets [Abstract]
Total assets	1,957,320		1,957,320		1,904,344
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	11,702	12,921	69,095	83,428
Operating income (loss):
Total operating income (loss)	1,078	(1,084)	10,197	10,457
Depreciation and amortization [Abstract]
Total depreciation and amortization	451	594	1,426	1,619
Assets [Abstract]
Total assets	49,079		49,079		44,279
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	6,099	7,527	25,018	38,527
Operating income (loss):
Total operating income (loss)	1,742	1,059	6,749	8,772
Depreciation and amortization [Abstract]
Total depreciation and amortization	6	0	12	0
Assets [Abstract]
Total assets	10,656		10,656		11,907
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	10,056	10,712	35,566	36,270
Operating income (loss):
Total operating income (loss)	(5,053)	(5,018)	(15,286)	(13,814)
Depreciation and amortization [Abstract]
Total depreciation and amortization	47	49	142	149
Assets [Abstract]
Total assets	16,402		16,402		2,950
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income (loss)	(24,961)	(24,779)	(72,640)	(77,734)
Depreciation and amortization [Abstract]
Total depreciation and amortization	1,925	$ 2,680	5,560	$ 7,355
Assets [Abstract]
Total assets	$ 41,511		$ 41,511		$ 34,868