v3.26.3
Cover - $ / shares
 9 Months Ended
Sep. 30, 2026
Nov. 12, 2026
Entity Addresses [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2026  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-43277  
Entity Registrant Name Boost Run Inc.  
Entity Central Index Key 0002090646  
Entity Tax Identification Number 39-4824850  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 400 Skokie Blvd.  
Entity Address, Address Line Two Suite 475  
Entity Address, City or Town Northbrook  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60062  
City Area Code (847)  
Local Phone Number 489-3367  
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share  
Trading Symbol BRUN  
Security Exchange Name NASDAQ  
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  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company false  
Common Class A [Member]    
Entity Addresses [Line Items]    
Entity Common Stock, Shares Outstanding   54,648,123
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Addresses [Line Items]    
Entity Common Stock, Shares Outstanding   29,533,018
Entity Listing, Par Value Per Share $ 0.0001  
Former Address [Member]    
Entity Addresses [Line Items]    
Entity Address, Address Line One 5 Revere Drive  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Northbrook  
Entity Address, State or Province IL