| Cover | 12 Months Ended |
| Sep. 30, 2024 shares | |
| Entity Addresses [Line Items] | |
| Document Type | 20-F/A |
| Amendment Flag | false |
| Document Registration Statement | false |
| Document Annual Report | true |
| Document Transition Report | false |
| Document Shell Company Report | false |
| Document Period End Date | Sep. 30, 2024 |
| Document Fiscal Period Focus | FY |
| Document Fiscal Year Focus | 2024 |
| Current Fiscal Year End Date | --09-30 |
| Entity File Number | 001-39805 |
| Entity Registrant Name | BGM Group Ltd |
| Entity Central Index Key | 0001779578 |
| Entity Incorporation, State or Country Code | E9 |
| 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, Country | CN |
| 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 |
| Elected Not To Use the Extended Transition Period | false |
| Document Accounting Standard | U.S. GAAP |
| Entity Shell Company | false |
| ICFR Auditor Attestation Flag | false |
| Document Financial Statement Error Correction [Flag] | false |
| Auditor Name | Enrome LLP |
| Auditor Location | Singapore |
| Auditor Firm ID | 6907 |
| Ordinary Shares [Member] | |
| Entity Addresses [Line Items] | |
| Entity Common Stock, Shares Outstanding | 7,226,480 |
| Common Class A [Member] | |
| Entity Addresses [Line Items] | |
| Entity Common Stock, Shares Outstanding | 6,006,480 |
| Common Class B [Member] | |
| Entity Addresses [Line Items] | |
| Entity Common Stock, Shares Outstanding | 1,220,000 |
| Business Contact [Member] | |
| Entity Addresses [Line Items] | |
| 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, Country | CN |
| Entity Address, Postal Zip Code | 610200 |
| City Area Code | 86 |
| Local Phone Number | 028-64775180 |
| Contact Personnel Name | Chen Xin |
| Contact Personnel Email Address | xinchen@qiliancorp.com |
