Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2021
Aug. 05, 2021
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001838361  
Entity File Number 001-40273  
Entity Registrant Name SUPERNOVA PARTNERS ACQUISITION COMPANY III, LTD.  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 98-1574762  
Entity Address, Address Line One 4301 50th Street NW  
Entity Address, Address Line Two Suite 300 PMB 1044  
Entity Address, City or Town Washington  
Entity Address, State or Province DC  
Entity Address, Postal Zip Code 20016  
City Area Code 202  
Local Phone Number 918-7050  
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  
Units    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant  
Trading Symbol STRE.U  
Security Exchange Name NYSE  
Class A Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol STRE  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   28,103,449
Warrants    
Document Information [Line Items]    
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol STRE WS  
Security Exchange Name NYSE  
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   7,025,862