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INVESTMENT IN JOINT VENTURE - JV Carrying Value Rollforward (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Nov. 30, 2023 | Dec. 31, 2022 | Nov. 30, 2022
Statement [Line Items] |  |  |  |
Revenue | $ 1,855 | $ 0 | $ 8,973 | $ 0
Net income | 90,375 |  | 14,354 |
Other comprehensive income |  | 0 |  | 0
Reconciliation of JCU net assets to Denison investment carrying value: |  |  |  |
Adjusted net assets of JCU-at December 31 |  | 38,609 |  | 42,784
Net income | 90,375 |  | 14,354 |
Investment from owners |  | 4,770 |  | 1,600
Net assets of JCU-at November 30, 2023 |  | $ 34,580 |  | $ 38,609
Denison ownership interest |  | 50.00% |  | 50.00%
Investment in JCU | 17,290 |  | 19,305 |
JCU |  |  |  |
Statement [Line Items] |  |  |  |
Net income |  | $ (8,799) |  | $ (5,775)
Reconciliation of JCU net assets to Denison investment carrying value: |  |  |  |
Net income |  | (8,799) |  | (5,775)
Investment in JCU | $ 17,290 | $ 17,290 | $ 19,305 | $ 19,305

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