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Share-Based Compensation - Narrative (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Share Based Compensation [Line Item] |  |
Share-based compensation expense | $ 3,650,000 |
Granting of share options percentage | 10.00% |
Issued and outstanding common shares at the time of grant, subject to a maximum | 39,670,000 |
Aggregate options granted | 30,259,260 | 28,725,593
Number of share units that are issuable | 15,000,000 |
Share options |  |
Share Based Compensation [Line Item] |  |
Weighted average share price at the date of exercise | $ 2.63 | $ 2.05
RSUs |  |
Share Based Compensation [Line Item] |  |
Weighted average share price at the date of exercise | 2.42 | 1.94
PSUs |  |
Share Based Compensation [Line Item] |  |
Weighted average share price at the date of exercise | $ 2.63 | $ 2.07

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- References No definition available. + Details
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Namespace Prefix: | dnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of share options granted + References No definition available. + Details
Name: | dnn_GrantingOfShareOptionsPercentage
Namespace Prefix: | dnn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | na
Period Type: | duration

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- Definition Number of shares issuable under the share unit plan. + References No definition available. + Details
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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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Data Type: | xbrli:stringItemType
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- References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=dnn_RSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=dnn_PSUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |