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Cash - Disclosure of detailed information about cash position (Details) $ in Thousands, $ in Thousands | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($)
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Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | $ 67,721 |  | $ 90,548 |  | $ 115,698
Cash held in Canadian dollars [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | 42,163 |  | 24,192 |  |
Cash held in U.S. dollars [Member] |  |  |  |  |
Disclosure Of Information For Cash [Line Items] |  |  |  |  |
Cash | $ 25,558 | $ 19,323 | $ 66,356 | $ 48,993 |

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- 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 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_Cash
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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

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