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INVESTMENT IN JOINT VENTURE - JV Carrying Value Rollforward (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Nov. 30, 2022
Dec. 31, 2021
Statement [Line Items]      
Revenue $ 16,945   $ 20,000
Net income (loss) 14,354   18,977
Reconciliation of JCU net assets to Denison investment carrying value:      
Adjusted net assets of JCU-at December 31, 2021     42,784
Net income (loss) 14,354   18,977
Investment from Owners 1,600    
Net assets of JCU-at December 31, 2022 $ 38,609    
Denison ownership interest 50.00%    
Total Investment in JCU $ 19,305   21,392
JCU      
Statement [Line Items]      
Net income (loss) (5,775) $ (5,775)  
Reconciliation of JCU net assets to Denison investment carrying value:      
Net income (loss) (5,775) $ (5,775)  
Total Investment in JCU $ 19,305   $ 21,392