| Cover | Dec. 04, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 4, 2020 |
| Entity Registrant Name | Sumo Logic, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39502 |
| Entity Tax Identification Number | 27-2234444 |
| Entity Address, Address Line One | 305 Main Street |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94063 |
| City Area Code | 650 |
| Local Phone Number | 810-8700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | SUMO |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001643269 |
