Loss Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Loss Per Common Unit
Loss from continuing operations	$ (134,502)	$ (33,766)
Less: Continuing operations income attributable to noncontrolling interests	(438)	(51)
Net loss from continuing operations attributable to NGL Energy Partners LP	(134,940)	(33,817)
Less: Distributions to preferred unitholders (1)	(24,551)	(22,054)
Less: Continuing operations net loss allocated to general partner (2)	159	56
NET LOSS FROM CONTINUING OPERATIONS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	(159,332)	(55,815)
Loss from discontinued operations, net of tax	0	(1,486)
Less: Discontinued operations loss allocated to general partner (2)	0	1
NET LOSS FROM DISCONTINUED OPERATIONS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	0	(1,485)
NET LOSS ALLOCATED TO COMMON UNITHOLDERS (NOTE 3)	$ (159,332)	$ (57,300)
BASIC LOSS PER COMMON UNIT
Loss From Continuing Operations	$ (1.23)	$ (0.43)
Loss From Discontinued Operations, net of Tax	0	(0.01)
Net Loss	(1.23)	(0.44)
DILUTED LOSS PER COMMON UNIT
Loss From Continuing Operations	(1.23)	(0.43)
Loss From Discontinued Operations, net of Tax	0	(0.01)
Net Loss	$ (1.23)	$ (0.44)
Basic weighted average common units outstanding (in units)	129,593,939	128,771,715
DILUTED WEIGHTED AVERAGE COMMON UNITS OUTSTANDING (in units)	129,593,939	128,771,715
Common units
BASIC LOSS PER COMMON UNIT
Loss From Continuing Operations	$ (1.23)	$ (0.43)
Loss From Discontinued Operations, net of Tax	0	(0.01)
Net Loss	(1.23)	(0.44)
DILUTED LOSS PER COMMON UNIT
Loss From Continuing Operations	(1.23)	(0.43)
Loss From Discontinued Operations, net of Tax	0	(0.01)
Net Loss	$ (1.23)	$ (0.44)
Basic weighted average common units outstanding (in units)	129,593,939	128,771,715
DILUTED WEIGHTED AVERAGE COMMON UNITS OUTSTANDING (in units)	129,593,939	128,771,715