Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 25, 2023	Mar. 26, 2022	Mar. 25, 2023	Mar. 26, 2022	Sep. 24, 2022
Revenues [Abstract]
Total revenues	$ 526,501	$ 588,095	$ 923,971	$ 963,502
Operating income (loss):
Total operating income	125,679	191,961	187,994	229,217
Reconciliation to net (loss) income:
Interest expense, net	19,871	15,254	35,865	30,553
Other, net	1,106	1,234	2,081	2,364
Provision for (benefit from) income taxes	225	371	177	(100)
Net income	104,477	175,102	149,871	196,400
Depreciation and amortization [Abstract]
Total depreciation and amortization	16,064	14,062	29,843	30,347
Assets [Abstract]
Total assets	2,351,105		2,351,105		$ 2,103,726
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	38,126	43,501	68,267	64,467
Operating income (loss):
Total operating income	6,347	7,185	8,429	8,879
Depreciation and amortization [Abstract]
Total depreciation and amortization	419	428	828	856
Assets [Abstract]
Total assets	55,245		55,245		49,683
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	3,138	3,450	4,230	5,120
Operating income (loss):
Total operating income	11,856	14,395	20,546	23,618
Depreciation and amortization [Abstract]
Total depreciation and amortization	0	5	3	10
Assets [Abstract]
Total assets	12,782		12,782		12,504
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	19,379	13,378	35,665	27,479
Operating income (loss):
Total operating income	(10,087)	(5,002)	(15,862)	(10,792)
Depreciation and amortization [Abstract]
Total depreciation and amortization	2,912	45	2,955	90
Assets [Abstract]
Total assets	243,211		243,211		47,853
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(30,678)	(35,058)	(60,170)	(61,951)
Depreciation and amortization [Abstract]
Total depreciation and amortization	1,402	1,820	2,836	3,893
Assets [Abstract]
Total assets	48,389		48,389		36,429
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	11,331	11,764	23,221	25,498
Operating income (loss):
Total operating income	457,140	516,821	799,493	847,938
Depreciation and amortization [Abstract]
Total depreciation and amortization	156,959	$ 221,386	251,367	$ 287,961
Assets [Abstract]
Total assets	$ 1,991,478		$ 1,991,478		$ 1,957,257