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Supplemental Financial Information - Lease expense (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Supplemental Financial Information [Abstract] |  |
Accretion expense on lease liabilities | $ (82) | $ (27)
Expenses relating to short-term leases | (6,189) | (5,753)
Expenses relating to non-short term low-value leases | (3) |
Lease related expense-gross | $ (6,274) | $ (5,780)

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

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- References No definition available. + Details
Name: | dnn_ExpensesRelatingToShortTermLeases
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | dnn_IncomeStatementLeaseRelatedAmount
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | dnn_LeaseRelatedExpenseGross
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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