Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 26, 2020
Revenues [Abstract]
Total revenues	$ 1,501,465	$ 1,288,755	$ 1,107,897
Operating income (loss):
Total operating income	206,327	213,236	140,270
Reconciliation to net income:
Loss on debt extinguishment	0	16,029	109
Interest expense, net	60,658	68,132	74,727
Other, net	5,532	5,172	4,822
Provision for (benefit from) income taxes	429	1,110	(146)
Net income	139,708	122,793	60,758
Depreciation and amortization [Abstract]
Total depreciation and amortization	58,848	104,555	116,791
Assets [Abstract]
Total assets	2,103,726	2,051,730
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	1,313,556	1,140,457	955,143
Operating income (loss):
Total operating income	337,377	330,443	239,771
Depreciation and amortization [Abstract]
Total depreciation and amortization	50,053	95,616	106,725
Assets [Abstract]
Total assets	1,957,257	1,935,399
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	95,157	67,104	75,039
Operating income (loss):
Total operating income	6,711	7,716	9,338
Depreciation and amortization [Abstract]
Total depreciation and amortization	1,693	1,654	1,843
Assets [Abstract]
Total assets	49,683	47,039
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	39,511	30,425	31,184
Operating income (loss):
Total operating income	6,598	7,409	7,459
Depreciation and amortization [Abstract]
Total depreciation and amortization	21	24	18
Assets [Abstract]
Total assets	12,504	11,275
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	53,241	50,769	46,531
Operating income (loss):
Total operating income	(21,982)	(20,119)	(20,377)
Depreciation and amortization [Abstract]
Total depreciation and amortization	179	188	189
Assets [Abstract]
Total assets	47,853	17,767
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(122,377)	(112,213)	(95,921)
Depreciation and amortization [Abstract]
Total depreciation and amortization	6,902	7,073	$ 8,016
Assets [Abstract]
Total assets	$ 36,429	$ 40,250