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Current Liabilites - Lease Liabilities - Additional Information (Details) | 12 Months Ended |
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Jun. 30, 2025 | Jun. 30, 2024
Lease liabilities [abstract] |  |
Lease liabilities term | Jul. 14, 2025 |
Incremental borrowing rate | 3.00% |
Lease liabilities renewal term | 0 years | 0 years

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- References No definition available. + Details
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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph C12 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2024-03-27 + Details
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Data Type: | dtr-2022:percentItemType
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- Definition Lease liabilities renewal term. + References No definition available. + Details
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Namespace Prefix: | opt_
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Balance Type: | na
Period Type: | instant

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- Definition Lease liabilities term. + References No definition available. + Details
Name: | opt_LeaseLiabilitiesTerm
Namespace Prefix: | opt_
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Period Type: | duration