v3.25.3
Cover - shares
 9 Months Ended
Sep. 30, 2025
Nov. 13, 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 Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Entity Information [Line Items]    
Entity Registrant Name BOLD EAGLE ACQUISITION CORP.  
Entity Central Index Key 0001852207  
Entity File Number 001-42385  
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 Feb. 22, 2021  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 955 Fifth Avenue  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10075  
Entity Phone Fax Numbers [Line Items]    
City Area Code (310)  
Local Phone Number 209-7280  
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one right to receive one twentieth (1/20) of a Class A ordinary share    
Entity Listings [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, $0.0001 par value, and one right to receive one twentieth (1/20) of a Class A ordinary share  
Trading Symbol BEAGU  
Security Exchange Name NASDAQ  
Class A ordinary shares, 0.0001 par value    
Entity Listings [Line Items]    
Title of 12(b) Security Class A ordinary shares, 0.0001 par value  
Trading Symbol BEAG  
Security Exchange Name NASDAQ  
Rights, each entitling the holder to receive one twentieth (1/20) of one Class A ordinary share    
Entity Listings [Line Items]    
Title of 12(b) Security Rights, each entitling the holder to receive one twentieth (1/20) of one Class A ordinary share  
Trading Symbol BEAGR  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   26,158,000
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   5,160,000