v3.26.3
Cover - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2026
Sep. 22, 2026
Dec. 31, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jun. 30, 2026    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2026    
Current Fiscal Year End Date --06-30    
Entity File Number 001-41956    
Entity Registrant Name AtlasClear Holdings, Inc.    
Entity Central Index Key 0001963088    
Entity Tax Identification Number 92-2303797    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 4350 West Cypress Street    
Entity Address, Address Line Two Suite 270    
Entity Address, City or Town Tampa    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33607    
City Area Code (727)    
Local Phone Number 446-6660    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol ATCH    
Security Exchange Name NYSEAMER    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 34.6
Entity Common Stock, Shares Outstanding   151,838,744  
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.0001    
Auditor Firm ID 457    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of AtlasClear Holdings, Inc. (the Company) as of June 30, 2026, and 2025, and the related consolidated statements of operations, changes in stockholders’ equity (deficit), and cash flows for the years ended June 30, 2026, and 2025 and related notes (collectively referred to as the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of June 30, 2026 and 2025, and the results of its operations and its cash flows for each of the years ended June 30, 2026 and 2025, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name Haynie    
Auditor Location Salt Lake City, Utah