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Non-Current Assets - Right of Use Assets - Additional Information (Details)	12 Months Ended
	Jun. 30, 2025
Disclosure of quantitative information about right-of-use assets [abstract]
Lease contract term	3 years
Lease expiration date	Jul. 14, 2025

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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- Definition

Lease contract term.

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No definition available.

+ Details

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

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- Definition

Lease expiration period.

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No definition available.

+ Details

Name:	opt_LeaseExpirationPeriod
Namespace Prefix:	opt_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration