XML 154 R142.htm IDEA: XBRL DOCUMENT v3.25.2

Share-Based Payments - Summary of Recognized Share Based Payment Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Disclosure Of Detailed Information About Recognized Share Based Payment Expenses [Abstract]
Director and employee services received	$ 6,128	$ 5,085	$ 5,835

X

- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure of detailed information about recognized share based payment expenses abstract.

+ References

No definition available.

+ Details

Name:	opt_DisclosureOfDetailedInformationAboutRecognizedShareBasedPaymentExpensesAbstract
Namespace Prefix:	opt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration