XML 139 R127.htm IDEA: XBRL DOCUMENT v3.25.2

Financial Risk Management Objectives and Policies - Summary of Judgments of Reasonably Possible Movements (Parenthetical) (Details)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Disclosure of risk management strategy related to hedge accounting [abstract]
Judgments of reasonably possible movements percentage	0.50%	0.50%	0.50%
Judgments of reasonably possible movements change in percentage	10.00%	10.00%	10.00%

X

- References

No definition available.

+ Details

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

X

- Definition

Judgments of reasonably possible movements change in percentage.

+ References

No definition available.

+ Details

Name:	opt_JudgmentsOfReasonablyPossibleMovementsChangeInPercentage
Namespace Prefix:	opt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Judgments of reasonably possible movements percentage.

+ References

No definition available.

+ Details

Name:	opt_JudgmentsOfReasonablyPossibleMovementsPercentage
Namespace Prefix:	opt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration