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Segmented information (Business segments) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Operating Segments [Line Items]    
Revenue $ 3,135,772 $ 2,587,758
Cost of products and services sold 2,072,488 1,805,768
Depreciation and amortization 280,702 220,324
Cost of sales 2,353,190 2,026,092
Gross profit (loss) 782,582 561,666
Administration 253,150 245,539
Exploration 19,419 17,551
Research and development 36,540 21,036
Other operating income (37,683) (7,509)
(Gain) loss on disposal of assets 1,042 2,188
Finance costs 147,171 115,869
Loss (gain) on derivatives 183,103 (37,791)
Finance income (21,228) (111,670)
Share of loss (earnings) from equity-accounted investees 10,844 (154,462)
Foreign exchange gains (65,517) (15,692)
Other expense (income) (975) (546)
Earnings (loss) before income taxes 256,716 487,153
Income tax expense 84,874 126,337
Net earnings (loss) 171,842 360,816
Capital expenditures for the year 211,635 153,631
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 2,676,620 2,153,153
Cost of products and services sold 1,757,155 1,532,316
Depreciation and amortization 238,726 175,457
Cost of sales 1,995,881 1,707,773
Gross profit (loss) 680,739 445,380
Administration 0 0
Exploration 19,419 17,551
Research and development 0 0
Other operating income (35,090) (1,875)
(Gain) loss on disposal of assets 253 1,825
Finance costs 0 0
Loss (gain) on derivatives 0 0
Finance income 0 0
Share of loss (earnings) from equity-accounted investees (207,583) (178,848)
Foreign exchange gains 0 0
Other expense (income) 0 (545)
Earnings (loss) before income taxes 903,740 607,272
Capital expenditures for the year 132,827 105,384
Fuel Services [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 459,152 425,557
Cost of products and services sold 316,040 266,062
Depreciation and amortization 37,236 35,426
Cost of sales 353,276 301,488
Gross profit (loss) 105,876 124,069
Administration 0 0
Exploration 0 0
Research and development 0 0
Other operating income (2,593) (5,634)
(Gain) loss on disposal of assets 791 363
Finance costs 0 0
Loss (gain) on derivatives 0 0
Finance income 0 0
Share of loss (earnings) from equity-accounted investees 0 0
Foreign exchange gains 0 0
Other expense (income) 0 0
Earnings (loss) before income taxes 107,678 129,340
Capital expenditures for the year 48,667 42,546
WEC [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 2,892,467 521,074
Cost of products and services sold 1,016,980 200,285
Depreciation and amortization 356,864 60,766
Cost of sales 1,373,844 261,051
Gross profit (loss) 1,518,623 260,023
Administration 1,460,657 244,400
Exploration 0 0
Research and development 0 0
Other operating income 0 0
(Gain) loss on disposal of assets 0 0
Finance costs 225,188 26,274
Loss (gain) on derivatives 0 2,838
Finance income (4,381) (1,885)
Share of loss (earnings) from equity-accounted investees 0 0
Foreign exchange gains 0 0
Other expense (income) 116,697 19,424
Earnings (loss) before income taxes (279,538) (31,028)
Capital expenditures for the year 176,229 42,405
Adjustments [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue (2,892,467) (521,074)
Cost of products and services sold (1,016,980) (200,285)
Depreciation and amortization (356,864) (60,766)
Cost of sales (1,373,844) (261,051)
Gross profit (loss) (1,518,623) (260,023)
Administration (1,460,657) (244,400)
Exploration 0 0
Research and development 0 0
Other operating income 0 0
(Gain) loss on disposal of assets 0 0
Finance costs (225,188) (26,274)
Loss (gain) on derivatives 0 (2,838)
Finance income 4,381 1,885
Share of loss (earnings) from equity-accounted investees 218,427 24,386
Foreign exchange gains 0 0
Other expense (income) (116,697) (19,424)
Earnings (loss) before income taxes 61,111 6,642
Capital expenditures for the year (176,229) (42,405)
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 0 9,048
Cost of products and services sold (707) 7,390
Depreciation and amortization 4,740 9,441
Cost of sales 4,033 16,831
Gross profit (loss) (4,033) (7,783)
Administration 253,150 245,539
Exploration 0 0
Research and development 36,540 21,036
Other operating income 0 0
(Gain) loss on disposal of assets (2) 0
Finance costs 147,171 115,869
Loss (gain) on derivatives 183,103 (37,791)
Finance income (21,228) (111,670)
Share of loss (earnings) from equity-accounted investees 0 0
Foreign exchange gains (65,517) (15,692)
Other expense (income) (975) (1)
Earnings (loss) before income taxes (536,275) (225,073)
Capital expenditures for the year $ 30,141 $ 5,701