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Related Party Disclosures - Summary of Trading Transactions with Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Ocelot
Disclosure of transactions between related parties [line items]
Purchase of Service	$ 32,793	$ 24,699
Amounts owed to related parties		141,554	$ 85,660
Launch Tx
Disclosure of transactions between related parties [line items]
Purchase of Service	9,900	2,700	900
Amounts owed to related parties			$ 900
Amounts owed by related parties	2,250	3,150
Lawrence Gozlan
Disclosure of transactions between related parties [line items]
Purchase of Service	275
Saama Technologies
Disclosure of transactions between related parties [line items]
Purchase of Service	$ 121	343
Amounts owed by related parties		$ 24

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
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X

- Definition

The amount of services received in related party transactions. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_21_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amounts due from related parties.

+ References

No definition available.

+ Details

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

X

- Definition

Amounts owed to related parties.

+ References

No definition available.

+ Details

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

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- Details

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Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=opt_LaunchTxMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=opt_LawrenceGozlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=opt_SaamaTechnologiesMember
Namespace Prefix:
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Period Type: