v3.26.1
Document and Entity Information - shares
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Document Type 20-F    
Document Registration Statement false    
Document Annual Report true    
Document Transition Report false    
Document Shell Company Report false    
Document Period End Date Sep. 30, 2025    
Entity File Number 001-39805    
Entity Registrant Name BGM Group Ltd    
Entity Incorporation, State or Country Code E9    
Entity Address, Country CN    
Entity Address, Address Line One No. 152 Hongliang East 1st Street, No. 1703    
Entity Address, Address Line Two Tianfu New District    
Entity Address, City or Town Chengdu    
Entity Address, Postal Zip Code 610200    
Title of 12(b) Security Class A Ordinary Shares    
Trading Symbol BGM    
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    
Entity Ex Transition Period false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Accounting Standard U.S. GAAP    
Entity Central Index Key 0001779578    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Enrome LLP Enrome LLP ZH CPA, LLC
Auditor Firm ID 6907 6907 6413
Auditor Location Singapore Singapore Denver, Colorado
Ordinary Shares      
Entity Common Stock, Shares Outstanding 200,623,358    
Common Class A      
Entity Common Stock, Shares Outstanding 180,623,358    
Common Class B      
Entity Common Stock, Shares Outstanding 20,000,000    
Business Contact      
Contact Personnel Email Address xinchen@qiliancorp.com    
Entity Address, Country CN    
Entity Address, Address Line One No. 152 Hongliang East 1st Street, No. 1703    
Entity Address, Address Line Two Tianfu New District    
Entity Address, City or Town Chengdu    
Entity Address, Postal Zip Code 610200    
Country Region 86    
City Area Code 028    
Local Phone Number 64775180    
Contact Personnel Name Chen Xin