XML 56 R47.htm IDEA: XBRL DOCUMENT v3.25.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation (Details) - ¥ / $	Mar. 31, 2025	Sep. 30, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Year-end spot rate	7.1782	7.0074
Average rate	7.1671	7.1178

X

- Definition

Foreign exchange average rate used to translate amounts denominated in functional currency to reporting currency.

+ References

No definition available.

+ Details

Name:	bgm_ForeignCurrencyExchangeAverageRate
Namespace Prefix:	bgm_
Data Type:	xbrli:pureItemType
Balance Type:	na
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

X

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479424/830-30-S99-1

+ Details

Name:	us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant