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Property, plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year $ 3,881,926  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 10,136  
Disposals (9)  
Depreciation charge (1,978)  
Right-of-use assets - end of year 8,149 $ 0
Property, plant and equipment - End of year 3,720,672 3,881,926
Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 9,009,461 9,140,575
Additions 75,211 55,362
Transfers 0 0
Change in reclamation provision 24,883 132,317
Disposals (5,751) (14,332)
JV Inkai restructuring [1]   (367,993)
Effect of movements in exchange rates (90,358) 63,532
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 9,013,446 9,009,461
Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 5,127,535 4,948,683
Depreciation charge 236,336 235,436
Transfers   0
Change in reclamation provision 2,732 59,616
Disposals (3,197) (10,685)
JV Inkai restructuring [1]   (167,143)
Effect of movements in exchange rates (62,483) 61,628
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 5,300,923 5,127,535
Land and buildgings [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,254,871  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 3,517  
Disposals 0  
Depreciation charge (871)  
Right-of-use assets - end of year 2,646 0
Property, plant and equipment - End of year 2,167,268 2,254,871
Land and buildgings [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 5,089,908 5,045,112
Additions 2,327 1,944
Transfers 17,157 104,760
Change in reclamation provision 24,883 132,317
Disposals (923) (186)
JV Inkai restructuring [1]   (245,882)
Effect of movements in exchange rates (32,642) 51,843
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 5,100,710 5,089,908
Land and buildgings [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,835,037 2,717,249
Depreciation charge 128,579 120,754
Transfers   13,036
Change in reclamation provision 2,732 59,616
Disposals (225) (185)
JV Inkai restructuring [1]   (123,919)
Effect of movements in exchange rates (30,035) 48,486
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 2,936,088 2,835,037
Plant and equipment [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 957,766  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 5,768  
Disposals (9)  
Depreciation charge (675)  
Right-of-use assets - end of year 5,084 0
Property, plant and equipment - End of year 890,200 957,766
Plant and equipment [member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,654,944 2,729,635
Additions 7,179 7,274
Transfers 28,453 20,044
Change in reclamation provision 0 0
Disposals (3,486) (7,355)
JV Inkai restructuring [1]   (109,748)
Effect of movements in exchange rates (8,925) 15,094
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 2,678,165 2,654,944
Plant and equipment [member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,697,178 1,611,460
Depreciation charge 105,700 111,465
Transfers   6,333
Change in reclamation provision 0 0
Disposals (2,194) (5,853)
JV Inkai restructuring [1]   (38,783)
Effect of movements in exchange rates (7,635) 12,556
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 1,793,049 1,697,178
Furniture and fixtures [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 5,223  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 851  
Disposals 0  
Depreciation charge (432)  
Right-of-use assets - end of year 419 0
Property, plant and equipment - End of year 4,687 5,223
Furniture and fixtures [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 80,083 90,817
Additions 158 0
Transfers 951 288
Change in reclamation provision 0 0
Disposals (142) (4,714)
JV Inkai restructuring [1]   (6,624)
Effect of movements in exchange rates (181) 316
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 80,869 80,083
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 74,860 80,752
Depreciation charge 2,057 3,217
Transfers   (322)
Change in reclamation provision 0 0
Disposals (139) (4,647)
JV Inkai restructuring [1]   (4,441)
Effect of movements in exchange rates (177) 301
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 76,601 74,860
Under constructions [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 26,666  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 0  
Disposals 0  
Depreciation charge 0  
Right-of-use assets - end of year 0 0
Property, plant and equipment - End of year 45,063 26,666
Under constructions [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 63,465 154,731
Additions 65,482 45,516
Transfers (46,561) (129,436)
Change in reclamation provision 0 0
Disposals (507) (1,663)
JV Inkai restructuring [1]   (5,739)
Effect of movements in exchange rates (17) 56
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 81,862 63,465
Under constructions [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 36,799 55,832
Depreciation charge 0 0
Transfers   (19,047)
Change in reclamation provision 0 0
Disposals 0 0
JV Inkai restructuring [1]   0
Effect of movements in exchange rates 0 14
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 36,799 36,799
Exploration and evaluation [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 637,400  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0  
Additions 0  
Disposals 0  
Depreciation charge 0  
Right-of-use assets - end of year 0 0
Property, plant and equipment - End of year 613,454 637,400
Exploration and evaluation [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,121,061 1,120,280
Additions 65 628
Transfers 0 4,344
Change in reclamation provision 0 0
Disposals (693) (414)
JV Inkai restructuring [1]   0
Effect of movements in exchange rates (48,593) (3,777)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 1,071,840 1,121,061
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 483,661 483,390
Depreciation charge 0 0
Transfers   0
Change in reclamation provision 0 0
Disposals (639) 0
JV Inkai restructuring [1]   0
Effect of movements in exchange rates (24,636) 271
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year $ 458,386 $ 483,661
[1]

Effective January 1, 2018, Cameco’s ownership interest in JV Inkai was reduced to 40 % r esulting in JV Inkai being accounted for on an equity basis instead of proportionate consolidation (see note 11 ).