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Investment in Joint Venture - JV Carrying Value Rollforward (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Nov. 30, 2024 | Dec. 31, 2023 | Nov. 30, 2023
Statement [Line Items] |  |  |  |
Revenue | $ 4,023 | $ 0 | $ 1,855 | $ 0
Net income (loss) | (91,119) |  | 90,375 |
Other comprehensive income |  | 0 |  | 0
Reconciliation of JCU net assets to Denison investment carrying value: |  |  |  |
Adjusted net assets of JCU-at December 31 |  | 34,580 |  | 38,609
Net income (loss) | (91,119) |  | 90,375 |
Investment from owners |  | 6,714 |  | 4,770
Net assets of JCU-at November 30 |  | $ 41,326 |  | $ 34,580
Denison ownership interest |  | 50.00% |  | 50.00%
Investment in JCU | 20,663 |  | 17,290 |
JCU |  |  |  |
Statement [Line Items] |  |  |  |
Net income (loss) |  | $ 32 |  | $ (8,799)
Reconciliation of JCU net assets to Denison investment carrying value: |  |  |  |
Net income (loss) |  | 32 |  | (8,799)
Investment in JCU | $ 20,663 | $ 20,663 | $ 17,290 | $ 17,290

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