Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended									6 Months Ended
	Mar. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011 Accounts Receivable - Trade:	Mar. 31, 2013 Accounts Receivable - Trade:	Mar. 31, 2012 Accounts Receivable - Trade:	Mar. 31, 2013 Accounts Receivable - Trade: Crude oil logistics	Mar. 31, 2013 Accounts Receivable - Trade: Water services	Mar. 31, 2013 Accounts Receivable - Trade: Natural gas liquids logistics	Mar. 31, 2012 Accounts Receivable - Trade: Natural gas liquids logistics	Mar. 31, 2013 Accounts Receivable - Trade: Retail propane	Mar. 31, 2012 Accounts Receivable - Trade: Retail propane	Mar. 31, 2013 Accounts Receivable - Trade: Other	Sep. 30, 2010 NGL Supply	Sep. 30, 2010 NGL Supply Accounts Receivable - Trade:
Accounts receivable
Gross Receivable					$ 564,649	$ 84,822	$ 360,721	$ 9,618	$ 144,267	$ 52,640	$ 49,233	$ 32,182	$ 810
Allowance for Doubtful Accounts		1,760	818	161	1,760	818	11	29	76	113	1,644	705			174
Changes in the allowance for doubtful accounts
Allowance for doubtful accounts, beginning of period		818			818	161	11	29	76	113	1,644	705			235
Bad debt provision	269	1,315	1,049	269	1,315	1,049								3	3
Write off of uncollectible accounts				(108)	(373)	(392)									(64)
Allowance for doubtful accounts, end of period		$ 1,760	$ 818	$ 161	$ 1,760	$ 818	$ 11	$ 29	$ 76	$ 113	$ 1,644	$ 705			$ 174