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Share-Based Payments - Summary of Recognized Share Based Payment Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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

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- 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