v3.25.2

Cash - Disclosure of cash position (Details) $ in Thousands, $ in Millions | Dec. 31, 2025 CAD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | ---
Disclosure of information for cash [Line Items] |  |  |  |  |
Total cash |  | $ 142,131 |  | $ 59,096 | $ 51,204
Cash held in U.S. dollars [Member] |  |  |  |  |
Disclosure of information for cash [Line Items] |  |  |  |  |
Total cash |  | 130,509 |  | 48,223 |
Cash held in Canadian dollars [Member] |  |  |  |  |
Disclosure of information for cash [Line Items] |  |  |  |  |
Total cash | $ 15.9 | $ 11,622 | $ 15.6 | $ 10,873 |

X
- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_Cash
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | or_DisclosureOfInformationForCashLineItems
Namespace Prefix: | or_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | or_ComponentsOfCashAndCashEquivalentsAxis=or_CashHeldInUSDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | or_ComponentsOfCashAndCashEquivalentsAxis=or_CashHeldInCadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |