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POST-EMPLOYMENT BENEFITS - Balance (Details) - CAD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
POST-EMPLOYMENT BENEFITS |  |  |
Current post-employment benefits | $ 120 | $ 120 |
Non-current post-employment benefits | 1,081 | 1,154 |
Total post-employment benefits | 1,201 | 1,274 | $ 1,361
Defined Benefit Plan |  |  |
POST-EMPLOYMENT BENEFITS |  |  |
Total post-employment benefits | $ 1,201 | $ 1,274 |

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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
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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
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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
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Namespace Prefix: |
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Balance Type: |
Period Type: |