| Cover | Aug. 11, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 11, 2022 |
| Entity Registrant Name | Toast, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40819 |
| Entity Tax Identification Number | 45-4168768 |
| Entity Address, Address Line One | 401 Park Drive, |
| Entity Address, Address Line Two | Suite 801 |
| Entity Address, City or Town | Boston |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02215 |
| City Area Code | 617 |
| Local Phone Number | 297-1005 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.000001 per share |
| Trading Symbol | TOST |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001650164 |
| Amendment Flag | false |
