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Schedule of share based payment reserve (Details)	Jun. 30, 2025 USD ($) shares	Jun. 30, 2025 SGD ($) shares	Jun. 19, 2025 USD ($) shares	Jun. 19, 2025 SGD ($) shares	May 19, 2025 USD ($) shares	May 19, 2025 SGD ($) shares	Apr. 19, 2025 USD ($) shares	Apr. 19, 2025 SGD ($) shares	Mar. 19, 2025 USD ($) shares	Mar. 19, 2025 SGD ($) shares	Jun. 30, 2024 shares
Notes and other explanatory information [abstract]
Sharebased payment reserve	$ 76,605	$ 100,000	$ 19,465	$ 25,000	$ 19,321	$ 25,000	$ 19,064	$ 25,000	$ 18,755	$ 25,000
Sharebased payment reserve, Price per share			2.67	2.67	2.37	2.37	4.45	4.45	4.04	4.04
Sharebased payment reserve, shares	24,368	24,368	7,290	7,290	8,152	8,152	4,284	4,284	4,642	4,642

X

- Definition

Reserve of sharebased payments price per share.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Reserve of sharebased payments shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	BMGL_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

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X

- Definition

A component of equity resulting from share-based payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2024-03-27

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Balance Type:	credit
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