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Cover Page
 3 Months Ended
Mar. 31, 2023
Document Information [Line Items]  
Document Type S-4/A
Entity Registrant Name FIFTH WALL ACQUISITION CORP. III
Entity Incorporation, State or Country Code E9
Entity Primary SIC Number 6770
Entity Tax Identification Number 98-1583957
Entity Address, Address Line One 1 Little West 12th Street
Entity Address, Address Line Two 4th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10014
City Area Code 310
Local Phone Number 853-8878
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001847874
Amendment Flag true
Amendment Description AMENDMENT NO. 3
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Brendan Wallace
Entity Address, Address Line One 1 Little West 12th Street
Entity Address, Address Line Two 4th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10014
City Area Code 310
Local Phone Number 853-8878