| Document and Entity Information | Mar. 08, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001837240 |
| Document Type | 8-K |
| Document Period End Date | Mar. 08, 2024 |
| Entity Registrant Name | SYMBOTIC INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40175 |
| Entity Tax Identification Number | 98-1572401 |
| Entity Address, Address Line One | 200 Research Drive |
| Entity Address, City or Town | Wilmington |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01887 |
| City Area Code | (987) |
| Local Phone Number | 284-2800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A common stock, par value $0.0001 per share |
| Trading Symbol | SYM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
