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Key Management Personnel - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Director and Key Management Personnel
Disclosure Of Transactions Between Related Parties [Line Items]
Related party transactions	$ 0	$ 0

X

- 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

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

X

- Definition

Related party transactions.

+ References

No definition available.

+ Details

Name:	opt_RelatedPartyTransactions
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=opt_DirectorAndKeyManagementPersonnelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: