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SEGMENTED INFORMATION - Revenue Concentration (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
SEGMENTED INFORMATION |  |
Revenue Concentration | 100.00% | 100.00%
Mining | Segments Operating |  |
SEGMENTED INFORMATION |  |
Revenue Concentration | 53.00% | 16.00%
Closed mines services |  |
SEGMENTED INFORMATION |  |
Revenue Concentration | 47.00% | 44.00%
Corporate and other segment |  |
SEGMENTED INFORMATION |  |
Revenue Concentration |  | 40.00%

X
- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity's ordinary activities in exchange for consideration. + References No definition available. + Details
Name: | dnn_RevenueConcentration
Namespace Prefix: | dnn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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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_SegmentedInformationLineItems
Namespace Prefix: | dnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SegmentsAxis=dnn_MiningMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dnn_SegmentsConsolidationItemsAxis=dnn_SegmentsOperatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=dnn_ClosedMinesServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=dnn_CorporateAndOtherSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |