Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Oaktree Capital Management L.P. Class A Convertible Preferred Units	Accumulated other comprehensive income (loss)	Noncontrolling interests	NGL Energy Holdings LLC	Class B Perpetual Preferred Units	Class B Perpetual Preferred Units Class B Perpetual Preferred Units	Class C Perpetual Preferred Units	Class C Perpetual Preferred Units Class C Perpetual Preferred Units	Preferred Class B and Class C Preferred Units	Preferred Class B and Class C Preferred Units Preferred Class B and Class C Preferred Units	Limited Partner	Limited Partner Common units
Beginning Balance (in units) at Mar. 31, 2019							8,400,000						124,508,497
Beginning Balance at Mar. 31, 2019	$ 2,277,818		$ (255)	$ 58,748	$ (50,603)	$ 202,731						$ 2,067,197
Increase (Decrease) in Partnership Capital
Distributions to general and common unit partners and preferred unitholders (Note 9)	(258,362)				(342)							(258,020)
Distributions to noncontrolling interest owners	(1,145)			(1,145)
Mesquite Disposals Unlimited, LLC ("Mesquite") acquisition	17,124			17,124
Investment in NGL Energy Holdings LLC (Note 12)	(15,226)											(15,226)
Equity issued pursuant to incentive compensation plan (in units)													2,938,481
Equity issued pursuant to incentive compensation plan (Note 9)	32,964				33							32,931
Common unit repurchases and cancellations (in units)													(133,634)
Common unit repurchases and cancellations (Note 9)	(1,644)											(1,644)
Warrants exercised (in units)													1,458,371
Warrants exercised (Note 9)	15											15
Accretion of beneficial conversion feature of 10.75% Class A convertible preferred units (Note 9)	(36,517)	$ (36,500)										(36,517)
10.75% Class A convertible preferred units redemption - amount paid in excess of carrying value (Note 9)	(78,797)											(78,797)
Units issued, net of offering costs (in units)							4,185,642		1,800,000
Units issued, net of offering costs (Note 9)					100	$ 102,737		$ 42,891
Issuance of warrants, net of offering costs (Note 9)	52,742											52,742
Net (loss) income	(398,780)			(1,773)	(478)							(396,529)
Other comprehensive (loss) income	(130)		(130)
Ending Balance (in units) at Mar. 31, 2020											14,385,642		128,771,715
Ending Balance at Mar. 31, 2020	1,735,690		(385)	72,954	(51,390)					$ 348,359		1,366,152
Increase (Decrease) in Partnership Capital
Distributions to general and common unit partners and preferred unitholders (Note 9)	(147,780)				(65)							(147,715)
Distributions to noncontrolling interest owners	(4,115)			(4,115)
Investment in NGL Energy Holdings LLC (Note 12)	0
Equity issued pursuant to incentive compensation plan (in units)													892,450
Equity issued pursuant to incentive compensation plan (Note 9)	4,727				0							4,727
Common unit repurchases and cancellations (in units)													(70,226)
Common unit repurchases and cancellations (Note 9)	(182)											(182)
Units issued, net of offering costs (Note 9)					100
Net (loss) income	(639,187)			632	(733)							(639,086)
Other comprehensive (loss) income	119		119
Ending Balance (in units) at Mar. 31, 2021											14,385,642		129,593,939
Ending Balance at Mar. 31, 2021	948,159		(266)	69,471	(52,189)					348,359		582,784
Increase (Decrease) in Partnership Capital
Cumulative effect adjustment for adoption of ASU 2016-13 (Note 16)	(1,113)
Cumulative effect adjustment for adoption of ASU 2016-13 (Note 16) | Accounting Standards Update 2016-13					(1)							(1,112)
Distributions to noncontrolling interest owners	(1,635)			(1,635)
Investment in NGL Energy Holdings LLC (Note 12)	0
Equity issued pursuant to incentive compensation plan (in units)													1,146,800
Equity issued pursuant to incentive compensation plan (Note 9)	3,259											3,259
Common unit repurchases and cancellations (in units)													(44,769)
Common unit repurchases and cancellations (Note 9)	(90)											(90)
Units issued, net of offering costs (Note 9)					100
Net (loss) income	(184,101)			655	(289)							(184,467)
Sawtooth joint venture disposition (Note 17)	(51,097)			(51,097)
Other comprehensive (loss) income	(42)		(42)
Ending Balance (in units) at Mar. 31, 2022											14,385,642		130,695,970
Ending Balance at Mar. 31, 2022	$ 714,453		$ (308)	$ 17,394	$ (52,478)					$ 348,359		$ 401,486