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v3.23.1

Exploration and evaluation (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Statements Line Items |  |
Impairment | $ 0 | $ 42,668
Impairment charge, net of income taxes |  | $ 34,600

X
- Definition Represents amount of impairment loss reversal of impairment loss assets arising from exploration and evaluation of mineral resources. + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of impairment charge that is recognized on the reclassification date. + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Statement [Line Items] + References No definition available. + Details
Name: | or_StatementsLineItems
Namespace Prefix: | or_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration