Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Revenues [Abstract]
Total revenues		$ 1,432,518	$ 1,327,172	$ 1,429,194
Cost of Products Sold:
Total cost of products sold	[1]	563,706	522,196	590,131
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	332,193	312,720	314,715
Vehicle:
Total vehicle expenses	[3]	94,596	93,148	94,729
Other Controllable Expenses:
Total other controllable expenses	[4]	163,670	160,883	160,188
Operating income:
Reportable segment operating income		206,311	171,250	206,849
Reconciliation to net income:
Corporate and all other operating (loss)		(169,627)	(158,320)	(156,291)
Loss on debt extinguishment		0	(215)	0
Interest expense, net		(76,265)	(74,590)	(73,393)
Other, net		(22,128)	(21,537)	(9,036)
Provision for income taxes		(1,348)	(734)	(668)
Net income		106,570	74,174	123,752
Depreciation and amortization [Abstract]
Total depreciation and amortization		72,042	66,975	62,582
Assets [Abstract]
Total assets		2,296,274	2,272,761
Operating/Reportable Segments [Member]
Revenues [Abstract]
Total revenues		1,357,439	1,249,694	1,355,425
Cost of Products Sold:
Total cost of products sold	[1]	549,162	507,092	574,480
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	186,582	174,217	181,468
Vehicle:
Total vehicle expenses	[3]	77,052	74,207	74,965
Other Controllable Expenses:
Total other controllable expenses	[4]	115,549	115,087	112,303
Operating income:
Reportable segment operating income		375,938	329,570	363,140
Depreciation and amortization [Abstract]
Total depreciation and amortization		53,156	49,521	49,069
Assets [Abstract]
Total assets		1,984,583	1,966,292
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues		1,265,494	1,150,034	1,232,138
Cost of Products Sold:
Total cost of products sold	[1]	493,611	443,596	489,808
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	170,491	163,881	169,785
Vehicle:
Total vehicle expenses	[3]	73,819	71,118	71,588
Other Controllable Expenses:
Total other controllable expenses	[4]	108,098	106,998	102,403
Operating income:
Reportable segment operating income		367,393	316,209	351,162
Depreciation and amortization [Abstract]
Total depreciation and amortization		52,082	48,232	47,392
Assets [Abstract]
Total assets		1,933,532	1,912,465
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues		67,352	73,783	92,127
Cost of Products Sold:
Total cost of products sold	[1]	40,997	49,714	65,572
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	14,887	9,057	10,193
Vehicle:
Total vehicle expenses	[3]	3,233	3,089	3,377
Other Controllable Expenses:
Total other controllable expenses	[4]	3,707	4,432	5,379
Operating income:
Reportable segment operating income		3,454	6,202	5,932
Depreciation and amortization [Abstract]
Total depreciation and amortization		1,074	1,289	1,674
Assets [Abstract]
Total assets		41,078	43,579
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues		24,593	25,877	31,160
Cost of Products Sold:
Total cost of products sold	[1]	14,554	13,782	19,100
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	1,204	1,279	1,490
Vehicle:
Total vehicle expenses	[3]	0	0	0
Other Controllable Expenses:
Total other controllable expenses	[4]	3,744	3,657	4,521
Operating income:
Reportable segment operating income		5,091	7,159	6,046
Depreciation and amortization [Abstract]
Total depreciation and amortization		0	0	3
Assets [Abstract]
Total assets		9,973	10,248
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues		75,079	77,478	73,769
Cost of Products Sold:
Total cost of products sold	[1]	14,544	15,104	15,651
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	61,478	58,526	55,941
Vehicle:
Total vehicle expenses	[3]	3,346	3,196	3,117
Other Controllable Expenses:
Total other controllable expenses	[4]	21,109	20,597	23,948
Depreciation and amortization [Abstract]
Total depreciation and amortization		12,511	10,883	7,978
Assets [Abstract]
Total assets		260,393	250,445
Operating/Reportable Segments [Member] | Corporate [Member]
Payroll & Payroll Benefit Expenses:
Total payroll & payroll benefit expenses	[2]	84,133	79,977	77,306
Vehicle:
Total vehicle expenses	[3]	14,198	15,745	16,647
Other Controllable Expenses:
Total other controllable expenses	[4]	27,012	25,199	23,937
Depreciation and amortization [Abstract]
Total depreciation and amortization		6,375	6,571	$ 5,535
Assets [Abstract]
Total assets		$ 51,298	$ 56,024

[1] The cost of products sold reported in the consolidated statements of operations represents the weighted average unit cost of propane, fuel oil and refined fuels, and natural gas and electricity sold, including transportation costs to deliver products from the Partnership’s supply points to storage locations or to the Partnership’s customer service centers. Cost of products sold also includes the cost of appliances and related parts sold or installed computed on a basis that approximates the average cost of the products. Cost of products sold does not include depreciation and amortization expense.

[2] Payroll and payroll benefits expenses represent the compensation and benefit costs for field and direct operating support personnel.

[3] Vehicle expenses represent the costs of operating and maintaining the Partnership’s vehicle fleet and include fuel, lease expenses and maintenance and repair costs.

[4] Other controllable expenses include all other costs such as self-insurance, professional services and all other expenses not included within (1), (2) or (3) above.