v3.25.2
Cover
 12 Months Ended
Mar. 31, 2025
shares
Entity Addresses [Line Items]  
Document Type 20-F/A
Amendment Flag true
Amendment Description  This Amendment No. 1 to the Annual Report on Form 20-F of Bluemount Holdings Limited (the “Company”) amends the Company’s Annual Report on Form 20-F for the year ended March 31, 2025 (the “Original 20-F”), which was filed with the Securities and Exchange Commission on August 15, 2025. The Company is filing this Amendment No. 1 solely to submit the Interactive Data File (as defined in Rule 11 of Regulation S-T) as Exhibit 101 to this Form 20-F/A in accordance with Rule 405 of Regulation S-T. Exhibit 101 and 104 were omitted from the Original Form 20-F in accordance with the 30-day grace period provided under Rule 405 of Regulation S-T.   Except as described above, this Amendment No. 1 does not, and does not purport to, amend, modify or restate any information set forth in the Original 20-F, or reflect any events that occurred subsequent to the filing of the Original 20-F on August 15, 2025.
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Mar. 31, 2025
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2025
Current Fiscal Year End Date --03-31
Entity File Number 001-42739
Entity Registrant Name Bluemount Holdings Limited
Entity Central Index Key 0002027815
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Room 1007
Entity Address, Address Line Two 10/F
[custom:EntityAddressAddressLine4] 151 Gloucester Road
Entity Address, Address Line Three Capital Centre
Entity Address, City or Town Wan Chai
Entity Address, Country HK
Entity Address, Postal Zip Code 00000
Title of 12(b) Security Class B ordinary shares, par value $0.0001 per share
Trading Symbol BMHL
Security Exchange Name NASDAQ
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 Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 25,000,000
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction Flag false
Auditor name Chun shing Ho
Auditor Location Hong Kong
Auditor Firm ID 7020
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Room 1007
Entity Address, City or Town Wan Chai
Entity Address, Country HK
Entity Address, Postal Zip Code 00000
City Area Code 852
Local Phone Number 2137 2688
Contact Personnel Name principal executive offices