Consideration received from counterparty's purchase of shares.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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Period Type:	duration

- Definition

Increase (decrease) in number of shares through shares issued for cash

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of share options agreed to be granted.

+ References

No definition available.

+ Details

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

- Definition

Number of shares purchased by counterparty

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Duration of extended exercise period of share options grant in share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	gmtl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The description of the maximum term of options granted for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Types of share-based payment arrangements [domain]]

+ References

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+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The exercise price of share options granted.

+ References

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+ Details

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Data Type:	dtr-2022:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of share options granted in a share-based payment arrangement.

+ References

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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:perShareItemType
Balance Type:	na
Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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Data Type:	na
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- Details

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Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Data Type:	na
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- Details

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Post balance sheet events (Details)							1 Months Ended	12 Months Ended
Post balance sheet events (Details)	Aug. 17, 2026 shares	Jul. 17, 2026 USD ($) Option shares	Jul. 17, 2026 GBP (£) Option shares £ / shares	Jan. 02, 2026 shares	Jul. 22, 2025 shares	May 03, 2023 Option	Dec. 31, 2025 Option	Jun. 30, 2026 Option £ / shares shares	Jun. 30, 2025 Option £ / shares shares	Nov. 30, 2025 shares
Post balance sheet events
Number of share options granted \| Option								3,850,000	1,400,000
Exercise price \| £ / shares								£ 1.31	£ 0.09
Increase (decrease) in number of shares through shares issued for cash				229,249	25,945,000			55,369,010	29,286,754
Warrants
Post balance sheet events
Increase (decrease) in number of shares through shares issued for cash								2,214,996
Directors
Post balance sheet events
Number of share options granted \| Option								2,225,000
Directors \| Michael Schlumpberger
Post balance sheet events
Number of share options agreed to be granted										400,000
Number of share options granted \| Option							300,000
Chief Executive Officer Oliver Friesen
Post balance sheet events
Number of share options granted \| Option						2,104,859
Extended exercise period						5 years
Potential ordinary share transaction
Post balance sheet events
Number of share options granted \| Option		681,817	681,817
Major ordinary share transaction \| Warrants
Post balance sheet events
Increase (decrease) in number of shares through shares issued for cash	3,989,027
Major ordinary share transaction \| Directors \| Mark Thorpe
Post balance sheet events
Number of share options granted \| Option		400,000	400,000
Term of options		three years	three years
Exercise price, share options granted \| £ / shares			£ 2.55
Major ordinary share transaction \| Directors \| Mark Thorpe \| Tranche one
Post balance sheet events
Number of share options granted		100,000	100,000
Major ordinary share transaction \| Directors \| Mark Thorpe \| Tranche two
Post balance sheet events
Number of share options granted		300,000	300,000
Major ordinary share transaction \| Directors \| Michael Schlumpberger
Post balance sheet events
Number of share options granted \| Option		100,000	100,000
Number of shares purchased by counterparty		2,500	2,500
Exercise price, share options granted \| £ / shares			£ 1.31
Consideration received from counterparty's purchase of shares \| $		$ 5,005
Major ordinary share transaction \| Directors \| Michael Schlumpberger \| Tranche one
Post balance sheet events
Vesting percent		50.00%	50.00%
Major ordinary share transaction \| Directors \| Michael Schlumpberger \| Tranche two
Post balance sheet events
Vesting percent		50.00%	50.00%
Major ordinary share transaction \| Directors \| Jason Starzecki
Post balance sheet events
Number of shares purchased by counterparty		5,500	5,500
Consideration received from counterparty's purchase of shares \| $		$ 10,494
Major ordinary share transaction \| Chief Executive Officer Oliver Friesen
Post balance sheet events
Number of share options granted \| Option		181,817	181,817
Exercise price \| £ / shares			£ 0.1075
Number of shares purchased by counterparty		20,000	20,000
Consideration received from counterparty's purchase of shares \| £			£ 29,749.5