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STATEMENT OF COMPLIANCE AND ACCOUNTING POLICIES - Narrative (Details) | Jul. 19, 2021 CAD ($)
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Statement [Line Items] |
Termination payment received | $ 5,848,000

X
- 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
Name: | dnn_StatementLineItems
Namespace Prefix: | dnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of termination payment received. + References No definition available. + Details
Name: | dnn_TerminationPaymentReceived
Namespace Prefix: | dnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration