Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2018	Aug. 03, 2018
Document and Entity Information
Entity Registrant Name	NGL Energy Partners LP
Entity Central Index Key	0001504461
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		122,051,314
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1