Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($) $ in Thousands		6 Months Ended
		Mar. 26, 2022	Sep. 25, 2021
Goodwill [Line Items]
Goodwill		$ 1,113,089	$ 1,113,488
Accumulated adjustments		(6,462)	(6,462)
Goodwill, net		1,106,627	1,107,026
Goodwill disposed	[1]	(399)
Propane [Member]
Goodwill [Line Items]
Goodwill		1,094,289	1,094,688
Accumulated adjustments		0	0
Goodwill, net		1,094,289	1,094,688
Goodwill disposed	[1]	(399)
Fuel Oil and Refined Fuels [Member]
Goodwill [Line Items]
Goodwill		10,900	10,900
Accumulated adjustments		(6,462)	(6,462)
Goodwill, net		4,438	4,438
Goodwill disposed	[1]	0
Natural Gas and Electricity [Member]
Goodwill [Line Items]
Goodwill		7,900	7,900
Accumulated adjustments		0	0
Goodwill, net		7,900	$ 7,900
Goodwill disposed	[1]	$ 0

[1] Reflects the impact from the disposition of certain assets and operations in a non-strategic market of the propane segment (See Note 4),