XML 145 R133.htm IDEA: XBRL DOCUMENT
v3.25.2

Related Party Disclosures - Additional Information (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 19, 2024 | Aug. 28, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Disclosure of transactions between related parties [line items] |  |  |  |  |
Amount due to related party, interest expense |  |  | $ 32,793,000 | $ 24,699,000 | $ 13,462,000
Consultancy Agreement [member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Transaction costs paid |  |  | $ 275,000 | $ 125,000 |
Top of Range | Consultancy Agreement [member] |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Provision of services | $ 275,000 | $ 300,000 |  |  |
Ocelot |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Amounts owed to related party, effective rate |  |  | 23.00% |  |

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amounts owed to related party, effective rate. + References No definition available. + Details
Name: | opt_AmountsOwedToRelatedPartyEffectiveRate
Namespace Prefix: | opt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest expense related party transactions. + References No definition available. + Details
Name: | opt_InterestExpenseRelatedPartyTransactions
Namespace Prefix: | opt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition provision of Services + References No definition available. + Details
Name: | opt_ProvisionOfServices
Namespace Prefix: | opt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Transaction costs paid. + References No definition available. + Details
Name: | opt_TransactionCostsPaid
Namespace Prefix: | opt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_ServiceConcessionArrangementsAxis=opt_ConsultancyAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=opt_OcelotMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |