Loss Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Loss Per Common Unit
Net income	$ 28,285	$ 3,607	$ 47,848	$ 26,713
Less: Net income attributable to noncontrolling interests	(257)	(97)	(519)	(342)
NET INCOME ATTRIBUTABLE TO NGL ENERGY PARTNERS LP	28,028	3,510	47,329	26,371
Less: Distributions to preferred unitholders (1)	(34,744)	(30,436)	(68,541)	(57,981)
Less: Net loss allocated to GP (2)	7	27	21	32
NET LOSS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	$ (6,709)	$ (26,899)	$ (21,191)	$ (31,578)
Limited Partner
Loss Per Common Unit
Basic weighted average common units outstanding (in units)	131,927,343	130,695,970	131,927,343	130,695,970
DILUTED WEIGHTED AVERAGE COMMON UNITS OUTSTANDING (in units)	131,927,343	130,695,970	131,927,343	130,695,970
BASIC AND DILUTED LOSS PER COMMON UNIT	$ (0.05)	$ (0.21)	$ (0.16)	$ (0.24)