Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 10, 2021
Document Information [Line Items]      
Document Type 10-Q/A    
Document Quarterly Report   true  
Document Period End Date   Sep. 30, 2021  
Document Transition Report   false  
Entity File Number   001-40149  
Entity Registrant Name   ALTIMAR ACQUISITION CORP. III  
Entity Incorporation, State or Country Code   E9  
Entity Tax Identification Number   98-1576586  
Entity Address, Address Line One   40 West 57th Street  
Entity Address, Address Line Two   33rd Floor  
Entity Address, City or Town   New York  
Entity Address, State or Province   NY  
Entity Address, Postal Zip Code   10019  
City Area Code   212  
Local Phone Number   287-6767  
Entity Current Reporting Status   Yes  
Entity Interactive Data Current   Yes  
Entity Filer Category   Non-accelerated Filer  
Entity Small Business   true  
Entity Emerging Growth Company   true  
Entity Ex Transition Period   false  
Entity Shell Company   true  
Entity Central Index Key   0001841004  
Current Fiscal Year End Date   --12-31  
Document Fiscal Year Focus   2021  
Document Fiscal Period Focus   Q3  
Amendment Flag   true  
Amendment Description    
Units Each Consisting Of One Share Of Class Common Stock And One Third Of One Redeemable Warrant      
Document Information [Line Items]      
Title of 12(b) Security   Units, each consisting of oneClass A ordinary share, $0.0001 par value, andone-fourth of one redeemable warrant  
Trading Symbol   ATAQ.U  
Security Exchange Name   NYSE  
Class A ordinary share      
Document Information [Line Items]      
Title of 12(b) Security   Class A ordinary shares, $0.0001 par value  
Trading Symbol   ATAQ  
Security Exchange Name   NYSE  
Entity Common Stock, Shares Outstanding     15,525,000
Redeemable warrants, each whole warrant exercisable      
Document Information [Line Items]      
Title of 12(b) Security   Warrants, each whole warrant exercisable forone Class A ordinary share, each at an exerciseprice of $11.50 per share  
Trading Symbol   ATAQ WS  
Security Exchange Name   NYSE  
Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding     3,881,250