| Cover | Jun. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | Fifth Wall Acquisition Corp. III (the "Company") is filing this Amendment No. 1 to its Current Report on Form 8-K (the "8-K/A"), originally filed with the U.S. Securities and Exchange Commission (the "SEC") on June 3, 2021 (the "Original 8-K"), solely to amend and restate the Company's audited balance sheet and accompanying footnotes which were filed as an exhibit to the Original 8-K (the "IPO Balance Sheet"). |
| Document Period End Date | Jun. 3, 2021 |
| Entity File Number | 001-40415 |
| Entity Registrant Name | Fifth Wall Acquisition Corp. III |
| Entity Central Index Key | 0001847874 |
| Entity Tax Identification Number | 98-1583957 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 6060 Center Drive |
| Entity Address, Address Line Two | 10th Floor |
| Entity Address, City or Town | Los Angeles |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90045 |
| City Area Code | 310 |
| Local Phone Number | 853-8878 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Ordinary Shares, par value $0.0001 |
| Trading Symbol | FWAC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
