Equity (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2015 item shares	Mar. 31, 2015
Partnership equity
General partner interest (as a percent)	0.10%	0.10%
Limited partner interest (as a percent)	99.90%	99.90%
Number of Common Units that Subordinated Units are Converted into	1
Common Units | Water Solutions Facility
Partnership equity
Common units issued | shares	386,383