Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Revenues [Abstract]
Total revenues	$ 377,104	$ 373,277
Operating income:
Total operating income (loss)	48,534	56,920
Reconciliation to net income:
Interest expense, net	19,488	19,514
Other, net	1,176	1,172
Provision for (benefit from) income taxes	151	(934)
Net income	27,719	37,168
Depreciation and amortization [Abstract]
Total depreciation and amortization	30,071	31,131
Assets [Abstract]
Total assets	2,151,901		$ 2,101,199
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	321,360	322,130
Operating income:
Total operating income (loss)	70,471	75,723
Depreciation and amortization [Abstract]
Total depreciation and amortization	26,955	27,781
Assets [Abstract]
Total assets	2,029,238		1,995,060
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	28,909	25,315
Operating income:
Total operating income (loss)	3,470	3,824
Depreciation and amortization [Abstract]
Total depreciation and amortization	522	579
Assets [Abstract]
Total assets	53,401		47,911
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	13,404	13,147
Operating income:
Total operating income (loss)	2,828	3,485
Depreciation and amortization [Abstract]
Total depreciation and amortization	0	0
Assets [Abstract]
Total assets	15,844		13,067
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	13,431	12,685
Operating income:
Total operating income (loss)	(4,644)	(5,233)
Depreciation and amortization [Abstract]
Total depreciation and amortization	52	50
Assets [Abstract]
Total assets	3,930		3,363
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income:
Total operating income (loss)	(23,591)	(20,879)
Depreciation and amortization [Abstract]
Total depreciation and amortization	2,542	$ 2,721
Assets [Abstract]
Total assets	$ 49,488		$ 41,798