Document and Entity Information
| Document and Entity Information Document | Jan. 19, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 19, 2021 |
| Entity Registrant Name | NGL ENERGY PARTNERS LP |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35172 |
| Entity Tax Identification Number | 27-3427920 |
| Entity Address, Address Line One | 6120 South Yale Avenue |
| Entity Address, Address Line Two | Suite 805 |
| Entity Address, City or Town | Tulsa |
| Entity Address, State or Province | OK |
| Entity Address, Postal Zip Code | 74136 |
| City Area Code | 918 |
| Local Phone Number | 481-1119 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001504461 |
| Amendment Flag | false |
| NEW YORK STOCK EXCHANGE, INC. | Common Units | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common units representing Limited Partner Interests |
| Trading Symbol | NGL |
| Security Exchange Name | NYSE |
| NEW YORK STOCK EXCHANGE, INC. | Preferred Class B | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Fixed-to-floating rate cumulative redeemable perpetual preferred units |
| Trading Symbol | NGL-PB |
| Security Exchange Name | NYSE |
| NEW YORK STOCK EXCHANGE, INC. | Preferred Class C | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Fixed-to-floating rate cumulative redeemable perpetual preferred units |
| Trading Symbol | NGL-PC |
| Security Exchange Name | NYSE |