Unaudited Condensed Consolidating Guarantor and Non-Guarantor Financial Information - Unaudited Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Unaudited Condensed Consolidating Statement of Operations
REVENUES	$ 3,406,641	$ 2,685,006	$ 9,174,149	$ 9,416,670
COST OF SALES	3,228,022	2,433,500	8,723,192	8,761,877
OPERATING COSTS AND EXPENSES:
Operating	76,981	104,721	225,408	307,941
General and administrative	18,280	23,035	88,077	114,814
Depreciation and amortization	60,767	59,180	160,276	175,772
Loss (gain) on disposal or impairment of assets, net	34	1,328	(203,433)	3,040
Revaluation of liabilities	0	(19,312)	0	(46,416)
Operating Income	22,557	82,554	180,629	99,642
OTHER INCOME (EXPENSE):
Equity in earnings of unconsolidated entities	1,279	2,858	1,726	14,008
Revaluation of investments	0	0	(14,365)	0
Interest expense	(41,436)	(36,176)	(105,316)	(98,549)
Gain on early extinguishment of liabilities	0	0	30,890	0
Other income, net	20,007	2,161	25,860	2,941
Income (loss) before income taxes	2,407	51,397	119,424	18,042
INCOME TAX EXPENSE	(1,114)	(402)	(2,036)	1,846
Net Income	1,293	50,995	117,388	19,888
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(317)	(6,838)	(6,091)	(14,685)
LESS: DISTRIBUTIONS TO PREFERRED UNITHOLDERS	(8,906)	0	(20,958)	0
LESS: NET INCOME ALLOCATED TO GENERAL PARTNER	(22)	(16,239)	(180)	(47,798)
NET (LOSS) INCOME ALLOCATED TO COMMON UNITHOLDERS	(7,952)	27,918	90,159	(42,595)
Reportable Entity | NGL Energy Partners LP (Parent)
OTHER INCOME (EXPENSE):
Interest expense	(26,217)	(17,830)	(58,907)	(53,544)
Gain on early extinguishment of liabilities			8,614
Income (loss) before income taxes	(26,217)	(17,830)	(50,293)	(53,544)
EQUITY IN NET INCOME (LOSS) OF CONSOLIDATED SUBSIDIARIES	27,193	61,987	161,590	58,747
Net Income	976	44,157	111,297	5,203
NET (LOSS) INCOME ALLOCATED TO COMMON UNITHOLDERS	976	44,157	111,297	5,203
Reportable Entity | Guarantor Subsidiaries
Unaudited Condensed Consolidating Statement of Operations
REVENUES	3,393,541	2,639,958	9,142,575	9,290,209
COST OF SALES	3,226,175	2,436,088	8,720,039	8,769,526
OPERATING COSTS AND EXPENSES:
Operating	72,911	82,761	212,542	243,084
General and administrative	18,090	17,814	87,402	99,022
Depreciation and amortization	58,091	46,663	152,140	137,208
Loss (gain) on disposal or impairment of assets, net	37	1,484	(203,406)	3,199
Revaluation of liabilities		(19,312)		(46,416)
Operating Income	18,237	74,460	173,858	84,586
OTHER INCOME (EXPENSE):
Equity in earnings of unconsolidated entities	1,279	412	1,726	3,284
Revaluation of investments			(14,365)
Interest expense	(15,340)	(16,768)	(46,238)	(39,112)
Gain on early extinguishment of liabilities			22,276
Other income, net	20,206	2,141	26,196	2,832
Income (loss) before income taxes	24,382	60,245	163,453	51,590
INCOME TAX EXPENSE	(1,114)	(371)	(2,036)	1,915
EQUITY IN NET INCOME (LOSS) OF CONSOLIDATED SUBSIDIARIES	3,925	2,113	173	5,242
Net Income	27,193	61,987	161,590	58,747
NET (LOSS) INCOME ALLOCATED TO COMMON UNITHOLDERS	27,193	61,987	161,590	58,747
Reportable Entity | Non-Guarantor Subsidiaries
Unaudited Condensed Consolidating Statement of Operations
REVENUES	14,249	54,756	33,718	155,377
COST OF SALES	2,996	7,065	5,297	21,087
OPERATING COSTS AND EXPENSES:
Operating	4,070	22,015	12,866	65,037
General and administrative	190	5,221	675	15,792
Depreciation and amortization	2,676	12,517	8,136	38,564
Loss (gain) on disposal or impairment of assets, net	(3)	(156)	(27)	(159)
Operating Income	4,320	8,094	6,771	15,056
OTHER INCOME (EXPENSE):
Equity in earnings of unconsolidated entities	0	2,446	0	10,724
Interest expense	(98)	(1,662)	(551)	(6,125)
Other income, net	20	104	44	341
Income (loss) before income taxes	4,242	8,982	6,264	19,996
INCOME TAX EXPENSE	0	(31)	0	(69)
Net Income	4,242	8,951	6,264	19,927
NET (LOSS) INCOME ALLOCATED TO COMMON UNITHOLDERS	4,242	8,951	6,264	19,927
Consolidating Adjustments
Unaudited Condensed Consolidating Statement of Operations
REVENUES	(1,149)	(9,708)	(2,144)	(28,916)
COST OF SALES	(1,149)	(9,653)	(2,144)	(28,736)
OPERATING COSTS AND EXPENSES:
Operating	0	(55)	0	(180)
OTHER INCOME (EXPENSE):
Interest expense	219	84	380	232
Other income, net	(219)	(84)	(380)	(232)
EQUITY IN NET INCOME (LOSS) OF CONSOLIDATED SUBSIDIARIES	(31,118)	(64,100)	(161,763)	(63,989)
Net Income	(31,118)	(64,100)	(161,763)	(63,989)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(317)	(6,838)	(6,091)	(14,685)
LESS: DISTRIBUTIONS TO PREFERRED UNITHOLDERS	(8,906)		(20,958)
LESS: NET INCOME ALLOCATED TO GENERAL PARTNER	(22)	(16,239)	(180)	(47,798)
NET (LOSS) INCOME ALLOCATED TO COMMON UNITHOLDERS	$ (40,363)	$ (87,177)	$ (188,992)	$ (126,472)