Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Revenues [Abstract]
Total revenues	$ 1,288,755	$ 1,107,897	$ 1,267,705
Operating income (loss):
Total operating income	213,236	140,270	150,854
Reconciliation to net income:
Loss on debt extinguishment	16,029	109	0
Interest expense, net	68,132	74,727	76,663
Other, net	5,172	4,822	4,702
Provision for (benefit from) income taxes	1,110	(146)	857
Net income	122,793	60,758	68,632
Depreciation and amortization [Abstract]
Total depreciation and amortization	104,555	116,791	120,872
Assets [Abstract]
Total assets	2,051,730	2,047,253
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	1,140,457	955,143	1,083,446
Operating income (loss):
Total operating income	330,443	239,771	254,447
Depreciation and amortization [Abstract]
Total depreciation and amortization	95,616	106,725	108,763
Assets [Abstract]
Total assets	1,935,399	1,934,960
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	67,104	75,039	92,084
Operating income (loss):
Total operating income	7,716	9,338	8,489
Depreciation and amortization [Abstract]
Total depreciation and amortization	1,654	1,843	2,083
Assets [Abstract]
Total assets	47,039	47,063
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	30,425	31,184	45,206
Operating income (loss):
Total operating income	7,409	7,459	8,758
Depreciation and amortization [Abstract]
Total depreciation and amortization	24	18	0
Assets [Abstract]
Total assets	11,275	10,594
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	50,769	46,531	46,969
Operating income (loss):
Total operating income	(20,119)	(20,377)	(19,516)
Depreciation and amortization [Abstract]
Total depreciation and amortization	188	189	196
Assets [Abstract]
Total assets	17,767	18,733
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(112,213)	(95,921)	(101,324)
Depreciation and amortization [Abstract]
Total depreciation and amortization	7,073	8,016	$ 9,830
Assets [Abstract]
Total assets	$ 40,250	$ 35,903