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v3.25.4

Schedule of group’s current credit risk grading framework (Details) | 12 Months Ended
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Jun. 30, 2025
Category I [Member] |
IfrsStatementLineItems [Line Items] |
Definition of category | Counterparty has a low risk of default and does not have any past-due amounts.
Basis for recognizing ECL | 12-month ECL
Category II [Member] |
IfrsStatementLineItems [Line Items] |
Definition of category | Amount is >30 days past due or there has been a significant increase in credit risk since initial recognition.
Basis for recognizing ECL | Lifetime ECL - not credit-impaired
Category Three [Member] |
IfrsStatementLineItems [Line Items] |
Definition of category | Amount is >60 days past due or there is evidence indicating the asset is credit-impaired (in default).
Basis for recognizing ECL | Lifetime ECL - credit impaired
Category IV [Member] |
IfrsStatementLineItems [Line Items] |
Definition of category | There is evidence indicating that the debtor is in severe financial difficulty and the debtor has no realistic prospect of recovery.
Basis for recognizing ECL | Amount is written off

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- Definition Basis for recognizing expected credit loss. + References No definition available. + Details
Name: | BMGL_BasisForRecognizingExpectedCreditLoss
Namespace Prefix: | BMGL_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of credit risk. + References No definition available. + Details
Name: | BMGL_DescriptionOfCreditRisk
Namespace Prefix: | BMGL_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | BMGL_CategoryAxis=BMGL_CategoryOneMember
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Name: | BMGL_CategoryAxis=BMGL_CategoryTwoMember
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- Details
Name: | BMGL_CategoryAxis=BMGL_CategoryThreeMember
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Data Type: | na
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- Details
Name: | BMGL_CategoryAxis=BMGL_CategoryFourMember
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Data Type: | na
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