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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2024
PROPERTY, PLANT AND EQUIPMENT, NET
Subtotal	$ 44,767,635			$ 32,722,289
Less: accumulated depreciation	(34,138,298)			(24,112,010)
Property and equipment, net	10,629,337			8,610,279
Depreciation expense	422,670	$ 514,083	$ 547,192
Prepayments for property and equipment	644,854			660,569
Property received and accepted out of Prepayments	644,854			660,569
Property and Buildings
PROPERTY, PLANT AND EQUIPMENT, NET
Subtotal	13,260,613			13,518,768
Machinery and equipment
PROPERTY, PLANT AND EQUIPMENT, NET
Subtotal	25,562,916			18,774,867
Automobiles
PROPERTY, PLANT AND EQUIPMENT, NET
Subtotal	385,258			235,360
Office and electric equipment
PROPERTY, PLANT AND EQUIPMENT, NET
Subtotal	$ 5,558,848			$ 193,294

X

- Definition

The amount of Prepayments for property and equipment.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of property and equipment received and accepted against prepayments.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgm_
Data Type:	xbrli:monetaryItemType
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X

- Definition

It represents the value of property plant and equipment excluding construction in progress, net.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of property plant and equipment, excluding construction in progress, accumulated depreciation.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgm_
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X

- Definition

Amount excluding construction in progress before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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