v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 14, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Information [Line Items]    
Entity Registrant Name K&F GROWTH ACQUISITION CORP. II  
Entity Central Index Key 0002029976  
Entity File Number 001-42503  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Incorporation, Date of Incorporation Jul. 02, 2024  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 1219 Morningside Drive  
Entity Address, Address Line Two Suite 110  
Entity Address, City or Town Manhattan Beach  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90266  
Entity Phone Fax Numbers [Line Items]    
City Area Code 310  
Local Phone Number 545-9265  
Units, each consisting of one Class A ordinary share and one right    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one right  
Trading Symbol KFIIU  
Security Exchange Name NASDAQ  
Class A ordinary shares, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol KFII  
Security Exchange Name NASDAQ  
Rights, each right entitling the holder to receive one-fifteenth (1/15) of one Class A ordinary share upon the consummation of the initial business combination    
Entity Listings [Line Items]    
Title of 12(b) Security Rights, each right entitling the holder to receive one-fifteenth (1/15) of one Class A ordinary share  
Trading Symbol KFIIR  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   29,672,727
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   9,583,333