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Related Party Disclosures - Summary of Consolidated Financial Statements Include Financial Statements of Opthea Limited and Subsidiaries (Details) | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Vegenics Pty Ltd |  |  |
Disclosure Of Equity Interest In Subsidiaries [Line Items] |  |  |
Ownership percentage in subsidiary | 100.00% | 100.00% | 100.00%
Opthea US Inc |  |  |
Disclosure Of Equity Interest In Subsidiaries [Line Items] |  |  |
Ownership percentage in subsidiary | 100.00% | 100.00% | 100.00%

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Disclosure of Equity Interest in Subsidiaries. + References No definition available. + Details
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