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OTHER LIABILITIES - Post-employment benefits balance (Details) - CAD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
OTHER LIABILITIES [Line items] |  |  |
Current post-employment benefits | $ 120 | $ 120 |
Non-current post-employment benefits | 997 | 1,081 |
Total post-employment benefits | 1,117 | 1,201 | $ 1,274
Defined Benefit Plan |  |  |
OTHER LIABILITIES [Line items] |  |  |
Total post-employment benefits | $ 1,117 | $ 1,201 |

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- Definition The amount of provision for post-employment benefits held as current. + References No definition available. + Details
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Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of noncurrent provision for post-employment benefits. + References No definition available. + Details
Name: | dnn_NoncurrentProvisionForPostEmploymentBenefits
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 members defined in one or many axes of the table. + References No definition available. + Details
Name: | dnn_OtherLiabilitiesLineItems
Namespace Prefix: | dnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of total post-employment benefits + References No definition available. + Details
Name: | dnn_ProvisionForPostEmploymentBenefits
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=dnn_DefinedBenefitPlans1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |