| Cover | Dec. 18, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 18, 2024 |
| Entity File Number | 001-38950 |
| Entity Registrant Name | Grocery Outlet Holding Corp. |
| Entity Central Index Key | 0001771515 |
| Entity Tax Identification Number | 47-1874201 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 5650 Hollis Street |
| Entity Address, City or Town | Emeryville |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94608 |
| City Area Code | 510 |
| Local Phone Number | 845-1999 |
| 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 $0.001 per share |
| Trading Symbol | GO |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
