XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.25.2

Non-Current Assets - Prepayments | 12 Months Ended
--- | ---
Jun. 30, 2025
Disclosure Of Noncurrent Assets Prepayments [Abstract] |
Non-Current Assets - Prepayments | Note 22. Non-Current Assets - Prepayments
|  | June 30, 2025 |  |  | June 30, 2024 |
|  | US$(000's) |  |  | US$(000's) |
Prepayments |  |  | — |  |  |  | 467 |
Total non-current prepayments |  |  | — |  |  |  | 467 |

X
- Definition Disclosure of Noncurrent Assets Prepayments. + References No definition available. + Details
Name: | opt_DisclosureOfNoncurrentAssetsPrepaymentsAbstract
Namespace Prefix: | opt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The Entire Disclosure Of Noncurrent Assets Prepayments. + References No definition available. + Details
Name: | opt_DisclosureOfNoncurrentAssetsPrepaymentsExplanatory
Namespace Prefix: | opt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration