Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2024	Mar. 25, 2023	Mar. 30, 2024	Mar. 25, 2023	Sep. 30, 2023
Revenues:
Total revenues	$ 498,087	$ 526,501	$ 863,921	$ 923,971
Operating income (loss):
Total operating income	136,860	125,679	185,608	187,994
Reconciliation to net (loss) income:
Loss on debt extinguishment	215	0	215	0
Interest expense, net	19,919	19,871	38,111	35,865
Other, net	5,194	1,106	11,047	2,081
Provision for income taxes	32	225	281	177
Net Income	111,500	104,477	135,954	149,871
Depreciation and amortization:
Total depreciation and amortization	16,725	16,064	33,118	29,843
Assets:
Total assets	2,337,546		2,337,546		$ 2,270,475
Operating/Reportable Segments [Member] | Propane [Member]
Revenues:
Total revenues	437,564	457,140	750,922	799,493
Operating income (loss):
Total operating income	169,853	156,959	257,029	251,367
Depreciation and amortization:
Total depreciation and amortization	11,735	11,331	23,594	23,221
Assets:
Total assets	1,967,319		1,967,319		1,924,304
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues:
Total revenues	31,595	38,126	55,493	68,267
Operating income (loss):
Total operating income	5,887	6,347	8,059	8,429
Depreciation and amortization:
Total depreciation and amortization	302	419	746	828
Assets:
Total assets	49,769		49,769		46,341
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues:
Total revenues	8,713	11,856	15,206	20,546
Operating income (loss):
Total operating income	2,578	3,138	4,146	4,230
Depreciation and amortization:
Total depreciation and amortization	0	0	0	3
Assets:
Total assets	11,681		11,681		11,255
Operating/Reportable Segments [Member] | All Other [Member]
Revenues:
Total revenues	20,215	19,379	42,300	35,665
Operating income (loss):
Total operating income	(7,175)	(10,087)	(14,356)	(15,862)
Depreciation and amortization:
Total depreciation and amortization	2,707	2,912	5,407	2,955
Assets:
Total assets	241,240		241,240		239,691
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(34,283)	(30,678)	(69,270)	(60,170)
Depreciation and amortization:
Total depreciation and amortization	1,981	$ 1,402	3,371	$ 2,836
Assets:
Total assets	$ 67,537		$ 67,537		$ 48,884