XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.2
Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2022
Sep. 02, 2025
Dec. 31, 2024
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Fiscal Year Focus 2025      
Document Fiscal Period Focus FY      
Document Period End Date Jun. 30, 2025      
Document Annual Report true      
Document Transition Report false      
Current Fiscal Year End Date --06-30      
Entity Registrant Name Grayscale Bitcoin Cash Trust (BCH)      
Entity Central Index Key 0001732409      
Entity Small Business true      
Entity Emerging Growth Company true      
Entity Ex Transition Period true      
Entity Common Stock, Shares Outstanding     47,123,300  
Entity Public Float       $ 237,646,437
Entity Shell Company false      
Entity Filer Category Accelerated Filer      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity File Number 000-56308      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 82-6867376      
Entity Address, Address Line One 290 Harbor Drive, 4th Floor      
City Area Code 212      
Local Phone Number 668-1427      
Entity Address, City or Town Stamford      
Entity Address, Postal Zip Code 06902      
Entity Address, State or Province CT      
Title of 12(g) Security Grayscale Bitcoin Cash Trust (BCH) Shares      
Trading Symbol BCHG      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Documents Incorporated by Reference None      
Auditor Opinion [Text Block]

Opinion on the Financial Statements

      
Auditor Name KPMG LLP Marcum LLP    
Auditor Location New York, New York New York, New York    
Auditor Firm ID 185 688