Segment Information - Disclosure by Reportable Segment and Reconciliation of Total Operating Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Sep. 26, 2015
Revenues [Abstract]
Total revenues	$ 275,857	$ 422,944
Operating income (loss) [Abstract]:
Total operating income	31,344	75,968
Reconciliation to net income:
Interest expense, net	18,893	19,999
Provision for income taxes	185	162
Net income	12,266	55,807
Depreciation and amortization [Abstract]
Total depreciation and amortization	31,638	32,629
Assets [Abstract]
Total assets	2,453,017		$ 2,485,730
Operating/Reportable Segments [Member] | Propane [Member]
Revenues [Abstract]
Total revenues	231,475	354,650
Operating income (loss) [Abstract]:
Total operating income	55,583	103,076
Depreciation and amortization [Abstract]
Total depreciation and amortization	27,107	27,079
Assets [Abstract]
Total assets	2,261,541		2,209,343
Operating/Reportable Segments [Member] | Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	20,688	38,930
Operating income (loss) [Abstract]:
Total operating income	1,969	1,446
Depreciation and amortization [Abstract]
Total depreciation and amortization	696	833
Assets [Abstract]
Total assets	59,527		58,077
Operating/Reportable Segments [Member] | Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	11,674	15,967
Operating income (loss) [Abstract]:
Total operating income	2,252	2,758
Depreciation and amortization [Abstract]
Total depreciation and amortization	2	2
Assets [Abstract]
Total assets	15,141		13,253
Operating/Reportable Segments [Member] | All Other [Member]
Revenues [Abstract]
Total revenues	12,020	13,397
Operating income (loss) [Abstract]:
Total operating income	(7,056)	(5,678)
Depreciation and amortization [Abstract]
Total depreciation and amortization	82	80
Assets [Abstract]
Total assets	3,132		2,888
Operating/Reportable Segments [Member] | Corporate [Member]
Operating income (loss) [Abstract]:
Total operating income	(21,404)	(25,634)
Depreciation and amortization [Abstract]
Total depreciation and amortization	3,751	$ 4,635
Assets [Abstract]
Total assets	$ 113,676		$ 202,169