v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 20, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
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, Address Line One 3300 S. Dixie Highway, Suite 179  
Entity Address, City or Town West Palm Beach  
Entity Address State Or Province FL  
Entity Address, Postal Zip Code 33405  
City Area Code 650  
Local Phone Number 618-2524  
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 0002032528  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
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
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share    
Document and Entity Information    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol DRDBW  
Security Exchange Name NASDAQ  
Class B ordinary shares    
Document and Entity Information    
Entity Common Stock, Shares Outstanding   7,666,667