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Other Liabilities - Narrative (Details) - CAD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Other Liabilities [Line items] |  |  |
Letter of credit fees |  | $ 419,000 | $ 417,000
Description of letter of credit facility | (0.40% on the $7,972,000 covered by pledged cash collateral) and 0.75% respectively. During the year ended December 31, 2024, the Company incurred letter of credit fees of $419,000 (December 31, 2023 - $417,000) |  |
Maximum availability of LOC | $ 23,964,000 | 23,964,000 | $ 23,964,000
2023 Credit Facility |  |  |
Other Liabilities [Line items] |  |  |
Letter of credit and stand by fees | 0.40% |  |
Pledge of restricted cash and investments as collateral | $ 7,972,000 | $ 7,972,000 |
Letter of credit fees | 2.40% |  |
Standby fees percent | 0.75% |  |

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- References No definition available. + Details
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Namespace Prefix: | dnn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The percentage of the entity's letter of credit and stand by fees. + References No definition available. + Details
Name: | dnn_LetterOfCreditAndStandByFee
Namespace Prefix: | dnn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of maximum credit facility available. + References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | credit
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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- 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

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- References No definition available. + Details
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Namespace Prefix: | dnn_
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |