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SUPPLEMENTAL FINANCIAL INFORMATION - Lease expense (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
SUPPLEMENTAL FINANCIAL INFORMATION |  |
Accretion expense on lease liabilities | $ (27) | $ (32)
Expenses relating to short-term leases | (5,753) | (6,095)
Expenses relating to non-short term low-value leases | 0 | (1)
Lease related expense-gross | $ (5,780) | $ (6,128)

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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