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Cash Flow Statements Reconciliation - Summary of Cash Flow Statements Reconciliation (Details) (Paranthetical) - USD ($) $ in Thousands	12 Months Ended
	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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- 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