| Document and Entity Information | Nov. 29, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 29, 2023 |
| Entity Registrant Name | Presto Automation Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39830 |
| Entity Tax Identification Number | 84-2968594 |
| Entity Address, Address Line One | 985 Industrial Road |
| Entity Address, City or Town | San Carlos |
| Entity Address State Or Province | CA |
| Entity Address, Postal Zip Code | 94070 |
| City Area Code | 650 |
| Local Phone Number | 817-9012 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001822145 |
| Amendment Flag | false |
| Class A common stock, par value $0.0001 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | PRST |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one share of common stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of common stock |
| Trading Symbol | PRSTW |
| Security Exchange Name | NASDAQ |
