Goodwill and Other Intangible Assets - Carrying Values of Goodwill Assigned to Partnership's Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2023	Sep. 30, 2023
Goodwill [Line Items]
Goodwill	$ 1,155,238	$ 1,155,238
Accumulated adjustments	(6,462)	(6,462)
Goodwill, net	1,148,776	1,148,776
Goodwill acquired	0
Propane [Member]
Goodwill [Line Items]
Goodwill	1,105,179	1,105,179
Accumulated adjustments	0	0
Goodwill, net	1,105,179	1,105,179
Goodwill acquired	0
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	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	0
All Other [Member]
Goodwill [Line Items]
Goodwill	31,259	31,259
Accumulated adjustments	0	0
Goodwill, net	31,259	$ 31,259
Goodwill acquired	$ 0