Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended				12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended								12 Months Ended						12 Months Ended								12 Months Ended
	Mar. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2010 NGL Supply	Mar. 31, 2013 Natural gas liquids terminal assets	Mar. 31, 2012 Natural gas liquids terminal assets	Mar. 31, 2013 Retail propane equipment	Mar. 31, 2012 Retail propane equipment	Mar. 31, 2013 Retail propane equipment Minimum	Mar. 31, 2012 Retail propane equipment Minimum	Mar. 31, 2013 Retail propane equipment Maximum	Mar. 31, 2012 Retail propane equipment Maximum	Mar. 31, 2013 Vehicles	Mar. 31, 2012 Vehicles	Mar. 31, 2013 Vehicles Minimum	Mar. 31, 2012 Vehicles Minimum	Mar. 31, 2013 Vehicles Maximum	Mar. 31, 2012 Vehicles Maximum	Mar. 31, 2013 Water treatment facilities and equipment	Mar. 31, 2013 Water treatment facilities and equipment Minimum	Mar. 31, 2012 Water treatment facilities and equipment Minimum	Mar. 31, 2013 Water treatment facilities and equipment Maximum	Mar. 31, 2012 Water treatment facilities and equipment Maximum	Mar. 31, 2013 Crude oil tanks and loading facilities	Mar. 31, 2013 Crude oil tanks and loading facilities Minimum	Mar. 31, 2012 Crude oil tanks and loading facilities Minimum	Mar. 31, 2013 Crude oil tanks and loading facilities Maximum	Mar. 31, 2012 Crude oil tanks and loading facilities Maximum	Mar. 31, 2013 Barges and towboats	Mar. 31, 2012 Barges and towboats	Mar. 31, 2013 Information technology equipment	Mar. 31, 2012 Information technology equipment	Mar. 31, 2013 Information technology equipment Minimum	Mar. 31, 2012 Information technology equipment Minimum	Mar. 31, 2013 Information technology equipment Maximum	Mar. 31, 2012 Information technology equipment Maximum	Mar. 31, 2013 Buildings and leasehold improvements	Mar. 31, 2012 Buildings and leasehold improvements	Mar. 31, 2013 Buildings and leasehold improvements Minimum	Mar. 31, 2012 Buildings and leasehold improvements Minimum	Mar. 31, 2013 Buildings and leasehold improvements Maximum	Mar. 31, 2012 Buildings and leasehold improvements Maximum	Mar. 31, 2013 Land	Mar. 31, 2012 Land	Mar. 31, 2013 Other	Mar. 31, 2012 Other	Mar. 31, 2013 Other Minimum	Mar. 31, 2012 Other Minimum	Mar. 31, 2013 Other Maximum	Mar. 31, 2012 Other Maximum	Mar. 31, 2013 Construction in progress	Mar. 31, 2012 Construction in progress
Property, Plant and Equipment
DEPRECIABLE life					30 years	30 years			5 years	5 years	20 years	20 years			5 years	5 years	10 years	10 years		3 years	3 years	30 years	30 years		2 years	2 years	30 years	30 years	20 years	20 years			3 years	3 years	5 years	5 years			5 years	5 years	30 years	30 years					3 years	3 years	10 years	10 years
Property, plant and equipment, gross		$ 567,064	$ 244,237		$ 63,637	$ 62,024	$ 152,802	$ 119,972					$ 85,200	$ 26,372					$ 91,601					$ 21,308					$ 21,135		$ 12,169	$ 4,347					$ 48,394	$ 14,651					$ 21,604	$ 13,084	$ 17,288	$ 3,108					$ 31,926	$ 679
Less: Accumulated depreciation		(50,127)	(12,843)
Property, plant and equipment, net		516,937	231,394
Depreciation expense	$ 2,848	$ 39,196	$ 10,573	$ 998