The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Summary of Significant Accounting Policies (Details 6)	5 Months Ended	12 Months Ended
Summary of Significant Accounting Policies (Details 6)	Oct. 31, 2012 item	Mar. 31, 2012 item	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum	Sep. 30, 2010 NGL Supply	Mar. 31, 2013 Consolidated subsidiary formerly owned by unrelated parties of the predecessor entity
Noncontrolling Interests
Number of consolidated subsidiaries owned, formed, or acquired	2	1
Ownership interests (as a percent)			60.00%	80.00%
Ownership interests by unrelated parties (as a percent)					30.00%	100.00%