Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($) $ in Thousands		6 Months Ended
		Mar. 30, 2019	Sep. 29, 2018
Goodwill [Line Items]
Goodwill		$ 1,102,581	$ 1,099,932
Accumulated adjustments		(6,462)	(6,462)
Goodwill, net		1,096,119	1,093,470
Goodwill acquired	[1]	2,649
Propane [Member]
Goodwill [Line Items]
Goodwill		1,083,781	1,081,132
Accumulated adjustments		0	0
Goodwill, net		1,083,781	1,081,132
Goodwill acquired	[1]	2,649
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 acquired	[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 acquired	[1]	$ 0

[1] Reflects the impact from the acquisition (Note 4).