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Interest Expense on DFA - Summary of Interest Expense on DFA (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Material income and expense [abstract]
Interest expense on DFA		$ 46,457	$ 30,263	$ 13,462
Total interest expense on DFA	[1]	$ 46,457	$ 30,263	$ 13,462
[1] Development Funding Agreement ("DFA")

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- Definition

The amount of expense arising from interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2024-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2024-01-01
-Paragraph 23
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_d&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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X

- Definition

Interest expense on DFA.

+ References

No definition available.

+ Details

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Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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