XML 115 R101.htm IDEA: XBRL DOCUMENT
v3.25.4

Financial risk management (Details Narrative) | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
IfrsStatementLineItems [Line Items] |  |
Percentage of trade receivables | 1.00% |
Top of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Percentage of trade receivables |  | 2.00%
Bottom of range [member] |  |
IfrsStatementLineItems [Line Items] |  |
Percentage of trade receivables |  | 1.00%

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

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- Definition Percentage of trade receivables. + References No definition available. + Details
Name: | BMGL_PercentageOfTradeReceivables
Namespace Prefix: | BMGL_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |