| Cover | Dec. 02, 2021 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 2, 2021 |
| Entity File Number | 001-40203 |
| Entity Registrant Name | FTAC PARNASSUS ACQUISITION CORP. |
| Entity Central Index Key | 0001839972 |
| Entity Tax Identification Number | 85-4366403 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 2929 Arch Street |
| Entity Address, Address Line Two | Suite 1703 |
| Entity Address, City or Town | Philadelphia |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19104 |
| City Area Code | (215) |
| Local Phone Number | 701-9555 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Units, each consisting of one share of Class A common stock and one-fourth of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A common stock and one-fourth of one redeemable warrant |
| Trading Symbol | FTPAU |
| Security Exchange Name | NASDAQ |
| Class A common stock, par value $0.0001 per share | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | FTPA |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one share of Class A common stock | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A common stock |
| Trading Symbol | FTPAW |
| Security Exchange Name | NASDAQ |
