Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2013 Segment	Mar. 24, 2012	Mar. 30, 2013 Segment	Mar. 24, 2012	Sep. 29, 2012
Segment Information [Abstract]
Number of operating segments	5		5
Number of reportable segments	3		3
Revenues [Abstract]
Total revenues	$ 678,426	$ 357,626	$ 1,169,129	$ 657,512
Operating income [Abstract]
Total operating income	155,645	56,125	240,121	86,415
Reconciliation to net income [Abstract]
Loss on debt extinguishment	0	507	0	507
Interest expense, net	24,343	6,425	48,899	13,263
Provision for income taxes	150	(380)	282	(160)
Net income	131,152	49,573	190,940	72,805
Total depreciation and amortization	29,648	7,649	58,007	15,434
Total assets	2,955,779		2,955,779		2,884,448
Propane [Member]
Revenues [Abstract]
Total revenues	540,537	283,759	933,322	524,115
Operating income [Abstract]
Total operating income	179,961	70,483	286,269	113,981
Reconciliation to net income [Abstract]
Total depreciation and amortization	23,042	4,942	45,564	9,855
Total assets	2,558,422		2,558,422		2,529,021
Fuel Oil and Refined Fuels [Member]
Revenues [Abstract]
Total revenues	92,795	43,748	154,941	74,729
Operating income [Abstract]
Total operating income	5,742	3,465	6,441	5,931
Reconciliation to net income [Abstract]
Total depreciation and amortization	1,345	620	2,936	1,162
Total assets	115,827		115,827		101,108
Natural Gas and Electricity [Member]
Revenues [Abstract]
Total revenues	29,732	21,708	48,121	39,759
Operating income [Abstract]
Total operating income	5,711	1,639	8,277	4,343
Reconciliation to net income [Abstract]
Total depreciation and amortization	40	79	118	303
Total assets	20,099		20,099		14,777
All Other [Member]
Revenues [Abstract]
Total revenues	15,362	8,411	32,745	18,909
Operating income [Abstract]
Total operating income	(6,525)	(3,732)	(11,374)	(6,329)
Reconciliation to net income [Abstract]
Total depreciation and amortization	208	20	271	53
Total assets	4,487		4,487		7,232
Corporate [Member]
Operating income [Abstract]
Total operating income	(29,244)	(15,730)	(49,492)	(31,511)
Reconciliation to net income [Abstract]
Total depreciation and amortization	5,013	1,988	9,118	4,061
Total assets	$ 256,944		$ 256,944		$ 232,310