Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Sep. 25, 2021
Revenues [Abstract]
Total revenues	$ 375,407	$ 305,191
Operating income (loss):
Total operating income	37,256	57,686
Reconciliation to net income:
Interest expense, net	15,299	18,135
Other, net	1,130	1,078
(Benefit from) provision for income taxes	(471)	496
Net income	21,298	37,977
Depreciation and amortization [Abstract]
Total depreciation and amortization	16,285	28,017
Assets [Abstract]
Total assets	2,096,926		$ 2,051,730
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	331,117	268,624
Operating income (loss):
Total operating income	66,575	83,604
Depreciation and amortization [Abstract]
Total depreciation and amortization	13,734	25,691
Assets [Abstract]
Total assets	1,968,010		1,935,399
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	20,966	15,750
Operating income (loss):
Total operating income	1,694	2,625
Depreciation and amortization [Abstract]
Total depreciation and amortization	428	400
Assets [Abstract]
Total assets	52,101		47,039
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	9,223	6,876
Operating income (loss):
Total operating income	1,670	1,959
Depreciation and amortization [Abstract]
Total depreciation and amortization	5	6
Assets [Abstract]
Total assets	13,737		11,275
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	14,101	13,941
Operating income (loss):
Total operating income	(5,790)	(5,061)
Depreciation and amortization [Abstract]
Total depreciation and amortization	45	47
Assets [Abstract]
Total assets	19,513		17,767
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss):
Total operating income	(26,893)	(25,441)
Depreciation and amortization [Abstract]
Total depreciation and amortization	2,073	$ 1,873
Assets [Abstract]
Total assets	$ 43,565		$ 40,250