Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Revenues [Abstract]
Total revenues	$ 214,212	$ 241,936	$ 1,095,693	$ 1,151,495
Operating (loss) income:
Total operating (loss) income	(8,784)	4,233	181,840	188,557
Reconciliation to net (loss) income:
Interest expense, net	18,906	19,512	58,041	58,428
Other, net	1,176	1,172	3,527	3,518
Provision for (benefit from) income taxes	175	144	578	(749)
Net (loss) income	(29,041)	(16,595)	119,694	127,360
Depreciation and amortization [Abstract]
Total depreciation and amortization	30,151	31,259	90,845	94,593
Assets [Abstract]
Total assets	2,035,143		2,035,143		$ 2,101,199
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	183,052	205,400	937,468	990,344
Operating (loss) income:
Total operating (loss) income	21,038	29,245	254,159	249,363
Depreciation and amortization [Abstract]
Total depreciation and amortization	26,828	27,875	81,722	83,944
Assets [Abstract]
Total assets	1,933,169		1,933,169		1,995,060
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	12,921	15,400	83,428	82,414
Operating (loss) income:
Total operating (loss) income	(1,084)	(891)	10,457	10,132
Depreciation and amortization [Abstract]
Total depreciation and amortization	594	571	1,619	1,866
Assets [Abstract]
Total assets	46,772		46,772		47,911
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	7,527	10,403	38,527	43,942
Operating (loss) income:
Total operating (loss) income	1,059	2,192	8,772	11,131
Depreciation and amortization [Abstract]
Total depreciation and amortization	0	0	0	0
Assets [Abstract]
Total assets	12,035		12,035		13,067
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	10,712	10,733	36,270	34,795
Operating (loss) income:
Total operating (loss) income	(5,018)	(4,607)	(13,814)	(14,821)
Depreciation and amortization [Abstract]
Total depreciation and amortization	49	57	149	163
Assets [Abstract]
Total assets	3,753		3,753		3,363
Operating/Reportable Segments [Member] | Corporate [Member]
Operating (loss) income:
Total operating (loss) income	(24,779)	(21,706)	(77,734)	(67,248)
Depreciation and amortization [Abstract]
Total depreciation and amortization	2,680	$ 2,756	7,355	$ 8,620
Assets [Abstract]
Total assets	$ 39,414		$ 39,414		$ 41,798