v3.25.4
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 04, 2026
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-42435    
Entity Registrant Name Roman DBDR Acquisition Corp. II    
Entity Incorporation, State or Country Code E9    
Entity Tax Identification Number 00-0000000    
Entity Address, Postal Zip Code 33496    
Entity Address, Address Line One 9858 Clint Moore Road, Suite 205    
Entity Address, City or Town Boca Raton    
Entity Address State Or Province FL    
City Area Code 650    
Local Phone Number 618-2524    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company true    
Entity Public Float $ 237,130,000    
Entity Central Index Key 0002032528    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Transition Report true    
Auditor Name CBIZ CPAs P.C. Marcum LLP  
Auditor Location New York, NY New York, NY  
Auditor Firm ID 199 688  
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant      
Document and Entity Information      
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share and one-half of one Redeemable Warrant    
Trading Symbol DRDBU    
Security Exchange Name NASDAQ    
Class A Ordinary Shares      
Document and Entity Information      
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share    
Trading Symbol DRDB    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding     23,000,000
Redeemable Warrants, each whole warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50      
Document and Entity Information      
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 DRDBW    
Security Exchange Name NASDAQ    
Class B ordinary shares      
Document and Entity Information      
Entity Common Stock, Shares Outstanding     7,666,667