v3.26.1
Cover - $ / shares
6 Months Ended
Jun. 30, 2026
Aug. 04, 2026
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-43253  
Entity Registrant Name ARC GROUP ACQUISITION I CORP  
Entity Central Index Key 0002073515  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code D8  
Entity Address, Address Line One 398 S Mill Avenue  
Entity Address, Address Line Two Suite 306  
Entity Address, City or Town Tempe  
Entity Address, State or Province AZ  
Entity Address, Postal Zip Code 85284  
City Area Code (928)  
Local Phone Number 625-0928  
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 true  
Common Class A [Member]    
Entity Common Stock, Shares Outstanding   683,000
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Common Stock, Shares Outstanding   5,175,000
Entity Listing, Par Value Per Share $ 0.0001