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SUPPLEMENTAL FINANCIAL INFORMATION - Lease expense (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
SUPPLEMENTAL FINANCIAL INFORMATION |  |
Accretion expense on lease liabilities | $ (32) | $ (44)
Expenses relating to short-term leases | (6,095) | (3,920)
Expenses relating to non-short term low-value leases | (1) | (6)
Lease related expense-gross | $ (6,128) | $ (3,970)

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