Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 Months Ended	12 Months Ended				1 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended				6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended		12 Months Ended		6 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Crude oil logistics	Mar. 31, 2013 Water services	Jun. 30, 2012 Natural gas liquids logistics item	Mar. 31, 2011 Natural gas liquids logistics	Mar. 31, 2013 Natural gas liquids logistics	Mar. 31, 2012 Natural gas liquids logistics	Mar. 31, 2011 Natural gas liquids logistics Propane sales	Mar. 31, 2013 Natural gas liquids logistics Propane sales	Mar. 31, 2012 Natural gas liquids logistics Propane sales	Mar. 31, 2011 Natural gas liquids logistics Other natural gas liquids sales	Mar. 31, 2013 Natural gas liquids logistics Other natural gas liquids sales	Mar. 31, 2012 Natural gas liquids logistics Other natural gas liquids sales	Mar. 31, 2011 Natural gas liquids logistics Storage revenues and other	Mar. 31, 2013 Natural gas liquids logistics Storage revenues and other	Mar. 31, 2012 Natural gas liquids logistics Storage revenues and other	Mar. 31, 2011 Retail propane	Mar. 31, 2013 Retail propane item	Mar. 31, 2012 Retail propane	Mar. 31, 2011 Retail propane Propane sales	Mar. 31, 2013 Retail propane Propane sales	Mar. 31, 2012 Retail propane Propane sales	Mar. 31, 2013 Retail propane Distillate sales	Mar. 31, 2012 Retail propane Distillate sales	Mar. 31, 2011 Retail propane Other retail sales	Mar. 31, 2013 Retail propane Other retail sales	Mar. 31, 2012 Retail propane Other retail sales	Mar. 31, 2013 Other	Mar. 31, 2011 Elimination of intersegment sales	Mar. 31, 2013 Elimination of intersegment sales	Mar. 31, 2012 Elimination of intersegment sales	Mar. 31, 2011 Corporate and other	Sep. 30, 2010 Corporate and other	Mar. 31, 2013 Corporate and other	Mar. 31, 2012 Corporate and other	Sep. 30, 2010 NGL Supply	Sep. 30, 2010 NGL Supply Natural gas liquids logistics	Sep. 30, 2010 NGL Supply Natural gas liquids logistics Propane sales	Sep. 30, 2010 NGL Supply Natural gas liquids logistics Other natural gas liquids sales	Sep. 30, 2010 NGL Supply Natural gas liquids logistics Storage revenues and other	Sep. 30, 2010 NGL Supply Retail propane	Sep. 30, 2010 NGL Supply Retail propane Propane sales	Sep. 30, 2010 NGL Supply Retail propane Other retail sales	Sep. 30, 2010 NGL Supply Elimination of intersegment sales
Segment information
Reportable Segments														2
Number of operating divisions																												2
Revenues									$ 622,232	$ 4,417,767	$ 1,310,473	$ 2,339,148	$ 62,227					$ 477,774	$ 841,448	$ 923,022	$ 90,746	$ 858,276	$ 251,627	$ 1,183	$ 33,954	$ 2,462				$ 67,175	$ 288,410	$ 175,417	$ 106,192	$ 6,547	$ 5,638	$ 35,856	$ 17,370	$ 4,233	$ (20,284)	$ (151,977)	$ (65,972)					$ 316,943		$ 243,908	$ 71,456	$ 959		$ 6,128	$ 740	$ (6,248)
Depreciation and amortization									3,441	68,853	15,111	9,176	20,923		554	11,085	3,661										2,887	25,496	11,450									2,173								1,389	519				870
Operating income (loss)									14,837	87,307	15,030	34,236	8,576		9,590	30,336	9,735										7,362	46,869	9,616													(2,115)	(2,091)	(32,710)	(4,321)	(3,795)	865				(2,569)
Interest income									221	1,261	765																																			66
Interest expense									(2,482)	(32,994)	(7,620)																																			(372)
Loss on early extinguishment of debt										(5,769)
Other income (expense), net									103	260	290																																			124
INCOME TAX (PROVISION) BENEFIT										(1,875)	(601)																																			1,417
Net Income (Loss)	22,341	40,477	10,082	(24,710)	13,942	6,090	(5,395)	(6,773)	12,679	48,190	7,864																																			2,560
Additions to property, plant and equipment including acquisitions (accrual basis)									41,442	326,896	200,457	89,860	137,116		290	15,129	50,276										41,152	66,933	150,181															17,858		401	15				386
Total assets	2,291,347				749,519					2,291,347	749,519	801,030	466,462			474,141	325,173											513,301	417,639															36,413	6,707
Long-lived assets, net of depreciation and amortization, including goodwill and intangibles	$ 1,522,686				$ 548,129					$ 1,522,686	$ 548,129	$ 356,750	$ 453,986			$ 238,192	$ 176,419											$ 441,762	$ 366,242															$ 31,996	$ 5,468