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Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2025	Jun. 30, 2024
Statement of financial position [abstract]
Amounts owed by related parties current	$ 0	$ 2,724
Amounts owed by related party noncurrent	0	450
Amount due to related party current	0	0
Amount Due To Related Party	$ 0	$ 141,554

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- References

No definition available.

+ Details

Name:	ifrs-full_StatementOfFinancialPositionAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount due to related party.

+ References

No definition available.

+ Details

Name:	opt_AmountDueToRelatedParty
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount due to related party current.

+ References

No definition available.

+ Details

Name:	opt_AmountDueToRelatedPartyCurrent
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Related party payment current.

+ References

No definition available.

+ Details

Name:	opt_RelatedPartyPaymentCurrent
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Related party payment noncurrent.

+ References

No definition available.

+ Details

Name:	opt_RelatedPartyPaymentNoncurrent
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant