Loss Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Loss Per Common Unit
Loss from continuing operations	$ (18,982)	$ (380,423)	$ (154,691)	$ (408,201)
Less: Continuing operations loss (income) attributable to noncontrolling interests	63	34	(705)	(185)
Net loss from continuing operations attributable to NGL Energy Partners LP	(18,919)	(380,389)	(155,396)	(408,386)
Less: Distributions to preferred unitholders (1)	(26,361)	(23,770)	(77,198)	(69,594)
Less: Continuing operations net loss allocated to general partner (2)	47	404	233	477
NET LOSS FROM CONTINUING OPERATIONS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	(45,233)	(403,755)	(232,361)	(477,503)
Loss from discontinued operations, net of tax	0	(107)	0	(1,746)
Less: Discontinued operations loss allocated to general partner (2)	0	0	0	2
NET LOSS FROM DISCONTINUED OPERATIONS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	0	(107)	0	(1,744)
NET LOSS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	$ (45,233)	$ (403,862)	$ (232,361)	$ (479,247)
BASIC LOSS PER COMMON UNIT
Loss From Continuing Operations	$ (0.35)	$ (3.13)	$ (1.79)	$ (3.71)
Loss From Discontinued Operations, net of Tax	0	0	0	(0.01)
Net Loss	(0.35)	(3.13)	(1.79)	(3.72)
DILUTED LOSS PER COMMON UNIT
Loss From Continuing Operations	(0.35)	(3.13)	(1.79)	(3.71)
Loss From Discontinued Operations, net of Tax	0	0	0	(0.01)
Net Loss	$ (0.35)	$ (3.13)	$ (1.79)	$ (3.72)
Basic weighted average common units outstanding (in units)	129,810,245	128,991,414	129,666,303	128,845,214
DILUTED WEIGHTED AVERAGE COMMON UNITS OUTSTANDING (in units)	129,810,245	128,991,414	129,666,303	128,845,214
Common units
BASIC LOSS PER COMMON UNIT
Loss From Continuing Operations	$ (0.35)	$ (3.13)	$ (1.79)	$ (3.71)
Loss From Discontinued Operations, net of Tax	0	0	0	(0.01)
Net Loss	(0.35)	(3.13)	(1.79)	(3.72)
DILUTED LOSS PER COMMON UNIT
Loss From Continuing Operations	(0.35)	(3.13)	(1.79)	(3.71)
Loss From Discontinued Operations, net of Tax	0	0	0	(0.01)
Net Loss	$ (0.35)	$ (3.13)	$ (1.79)	$ (3.72)
Basic weighted average common units outstanding (in units)	129,810,245	128,991,414	129,666,303	128,845,214
DILUTED WEIGHTED AVERAGE COMMON UNITS OUTSTANDING (in units)	129,810,245	128,991,414	129,666,303	128,845,214