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Exploration and evaluation (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Statements Line Items |  |
Impairment | $ 42,668 | $ 0
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_
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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_
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Balance Type: | debit
Period Type: | duration

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