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RESTRICTED CASH AND INVESTMENTS - Narrative (Details) - CAD ($) | Dec. 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Statement [Line Items] |  |  |  |
Maximum availability of LOC | $ 23,964,000 |  |  | $ 24,000,000
Amount of restricted cash released |  | $ 1,163,000 |  |
Elliot Lake reclamation trust fund |  |  |  |
Statement [Line Items] |  |  |  |
Deposit | 1,199,000 |  |  | 793,000
Fund withdrew | 974,000 |  |  | $ 815,000
Letters of credit facility pledged assets |  |  |  |
Statement [Line Items] |  |  |  |
Amount on deposit | $ 7,972,000 |  |  |
Maximum availability of LOC |  | 22,972,000 |  |
Pledge of restricted cash and investments as collateral |  | 7,972,000 | $ 9,000,000 |
Released collateral portion of reclamation letters of credit in excess of the amount available under its letters of credit facility |  | 135,000 |  |
Amount of restricted cash released |  | $ 1,163,000 |  |

X
- Definition The amount of total restricted cash released. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of balances in customers' deposit accounts held by the entity that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
Name: | dnn_DepositeFromRestrictedCash
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Definition The amount of maximum credit facility available. + References No definition available. + Details
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Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The pledge of restricted cash and investments as collateral. + References No definition available. + Details
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Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of released collateral of reclamation letters of credit in excess of the amount available under its letters of credit facility. + References No definition available. + Details
Name: | dnn_ReleasedCollateralPortionOfReclamationLettersOfCreditInExcessOfAmountAvailableUnderItsLettersOfCreditFacility
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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