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Cash Flow Statements Reconciliation - Summary of Cash Flow Statements Reconciliation (Details) (Paranthetical) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Cash Flow Statement Reconciliation [Abstract] |  |  |
Interest expense on DFA includes amounts to related parties | $ 32,793 | $ 24,699 | $ 13,462

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- Definition Cash flow statement reconciliation. + References No definition available. + Details
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Namespace Prefix: | opt_
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Balance Type: | na
Period Type: | duration

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- 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