Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.21.1
Cover Page - shares
3 Months Ended
Mar. 31, 2021
Jun. 01, 2021
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity Registrant Name Altimar Acquisition Corp. III  
Entity Current Reporting Status No  
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 Q1  
Amendment Flag false  
Entity Address, State or Province NY  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 40 West 57th Street  
Entity Address, Address Line Two 33rd Floor  
Entity Address, City or Town New York  
Entity Tax Identification Number 98-1576586  
Entity Address, Postal Zip Code 10019  
City Area Code 212  
Local Phone Number 287-6767  
Entity File Number 001-40149  
Class A ordinary share    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   15,525,000
Trading Symbol ATAQ  
Title of 12(b) Security Class A ordinary shares, $0.0001 par value  
Security Exchange Name NYSE  
Class B ordinary share    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,881,250
Units Each Consisting Of One Share Of Class Common Stock And One Third Of One Redeemable Warrant    
Document Information [Line Items]    
Trading Symbol ATAQ.U  
Title of 12(b) Security Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fourth of one redeemable warrant  
Security Exchange Name NYSE  
Redeemable warrants, each whole warrant exercisable    
Document Information [Line Items]    
Trading Symbol ATAQ WS  
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share  
Security Exchange Name NYSE