Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Revenues [Abstract]
Total revenues	$ 1,429,194	$ 1,501,465	$ 1,288,755
Operating income (loss):
Total operating income	206,849	206,327	213,236
Reconciliation to net income:
Loss on debt extinguishment	0	0	16,029
Interest expense, net	73,393	60,658	68,132
Other, net	9,036	5,532	5,172
Provision for income taxes	668	429	1,110
Net income	123,752	139,708	122,793
Depreciation and amortization [Abstract]
Total depreciation and amortization	62,582	58,848	104,555
Assets [Abstract]
Total assets	2,270,475	2,103,726
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	1,232,138	1,313,556	1,140,457
Operating income (loss):
Total operating income	351,162	337,377	330,443
Depreciation and amortization [Abstract]
Total depreciation and amortization	47,392	50,053	95,616
Assets [Abstract]
Total assets	1,924,304	1,957,257
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	92,127	95,157	67,104
Operating income (loss):
Total operating income	5,932	6,711	7,716
Depreciation and amortization [Abstract]
Total depreciation and amortization	1,674	1,693	1,654
Assets [Abstract]
Total assets	46,341	49,683
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	31,160	39,511	30,425
Operating income (loss):
Total operating income	6,046	6,598	7,409
Depreciation and amortization [Abstract]
Total depreciation and amortization	3	21	24
Assets [Abstract]
Total assets	11,255	12,504
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	73,769	53,241	50,769
Operating income (loss):
Total operating income	(32,866)	(21,982)	(20,119)
Depreciation and amortization [Abstract]
Total depreciation and amortization	7,978	179	188
Assets [Abstract]
Total assets	239,691	47,853
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(123,425)	(122,377)	(112,213)
Depreciation and amortization [Abstract]
Total depreciation and amortization	5,535	6,902	$ 7,073
Assets [Abstract]
Total assets	$ 48,884	$ 36,429