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Other Liabilities - Lease Obligations (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Other Liabilities [Abstract] |  |
Opening Balance | $ 287,000 | $ 396,000
Accretion | 82,000 | 27,000
Additions | 2,215,000 | 33,000
Repayments | (251,000) | (168,000)
Liability adjustment gain |  | (1,000)
Ending Balance | 2,333,000 | $ 287,000
Lease inducements | $ 591,000 |

X
- Definition The amount of accretion lease obligations. + References No definition available. + Details
Name: | dnn_AccretionLeaseObligation
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase in lease obligations due to addition of new leases. + References No definition available. + Details
Name: | dnn_AdditionsInLeaseObligations
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain (loss) on adjustment of lease liability. + References No definition available. + Details
Name: | dnn_GainLossOnAdjustmentOnLeaseLiability
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of lease inducements. + References No definition available. + Details
Name: | dnn_LeaseInducements
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The cash outflow for payment of lease liabilities. + References No definition available. + Details
Name: | dnn_PaymentsOfLeaseLiabilities
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant