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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Bank acceptance notes receivable (Details) - USD ($)	Mar. 31, 2025	Sep. 30, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Bank acceptance notes receivable	$ 2,262,189	$ 3,337,137
Unmatured Bank Acceptance Notes Receivables	$ 2,073,990

X

- Definition

Amounts due from bank as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

+ References

No definition available.

+ Details

Name:	bgm_BankAcceptanceNotesReceivable
Namespace Prefix:	bgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of bank acceptance notes receivable which were endorsed by the companies and were unmatured as at the end

+ References

No definition available.

+ Details

Name:	bgm_UnmaturedBankAcceptanceNotesReceivablesEndorsedToMakePayments
Namespace Prefix:	bgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration