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Current Liabilities - Payables - Summary of Current Liabilities Payables (Parenthetical) (Details)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Current Liabilities Payables [Abstract]
Creditors settlement terms	30 day terms	30 day terms

X

- Definition

Creditors settlement terms.

+ References

No definition available.

+ Details

Name:	opt_CreditorsSettlementTerms
Namespace Prefix:	opt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Current liabilities – payables abstract.

+ References

No definition available.

+ Details

Name:	opt_CurrentLiabilitiesPayablesAbstract
Namespace Prefix:	opt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration