Summary of Significant Accounting Policies (Details 5) (USD $)	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
Mar. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2010 NGL Supply	Mar. 31, 2010 NGL Supply
Property, Plant and Equipment
Impairments of property, plant and equipment	$ 0	$ 0	$ 0	$ 0
Goodwill impairments	$ 0	$ 0	$ 0		$ 0

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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+ Details