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INVENTORIES, NET - Change of inventories provision (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Sep. 30, 2024
INVENTORIES, NET |  |
Beginning balance | $ 95,756 | $ 885,709
Addition | (53,200) | (813,619)
Exchange rate difference | (2,196) | 23,666
Ending balance | $ 40,360 | $ 95,756

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- Definition Amount of provision expense (reversal) added to the inventory valuation reserve. + References No definition available. + Details
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Namespace Prefix: | bgm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Difference due to foreign exchange rate added (reduced) to the inventory valuation reserve. + References No definition available. + Details
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Namespace Prefix: | bgm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of valuation reserve for inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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