v3.25.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 13, 2025
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Securities Act File Number 001-41757  
Entity Registrant Name HAYMAKER ACQUISITION CORP. 4  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 86-2213850  
Entity Address, Address Line One 501 Madison Avenue, Floor 5  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
City Area Code 212  
Local Phone Number 616-9600  
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 0001970509  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Amendment Flag false  
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 HYAC U  
Security Exchange Name NYSE  
Class A Ordinary Shares, par value $0.0001 per share    
Document and Entity Information    
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol HYAC  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   23,425,499
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 HYAC WS  
Security Exchange Name NYSE  
Class B Ordinary Shares    
Document and Entity Information    
Entity Common Stock, Shares Outstanding   5,750,000