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Segmented information - Business segments (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Segments [Line Items]    
Revenue $ 2,156,852 $ 2,431,404
Cost of products and services sold 1,390,233 1,596,235
Depreciation and amortization 330,345 371,689
Cost of sales 1,720,578 1,967,924
Gross profit 436,274 463,480
Administration 163,095 206,652
Impairment loss recognised in profit or loss, property plant and equipment 358,330 361,989
Exploration 29,933 42,579
Research and development 5,660 4,952
Other operating expense (income) 43 (34,075)
Loss on disposal of assets 6,947 23,168
Finance costs 110,608 111,906
Gain on derivatives (56,250) (34,407)
Finance income (5,265) (4,379)
Other income 30,410 (60,671)
Loss before income taxes (207,237) (154,234)
Income tax recovery (2,519) (94,355)
Net loss (204,718) (59,879)
Capital expenditures for the year 143,333 216,908
Uranium [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 1,574,068 1,717,896
Cost of products and services sold 910,685 993,012
Depreciation and amortization 267,931 281,159
Cost of sales 1,178,616 1,274,171
Gross profit 395,452 443,725
Administration 0 0
Impairment loss recognised in profit or loss, property plant and equipment 246,931 361,989
Exploration 29,933 42,579
Research and development 0 0
Other operating expense (income) 43 (34,075)
Loss on disposal of assets 5,901 22,787
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Other income 7,193 (56,219)
Loss before income taxes 105,451 106,664
Capital expenditures for the year 132,073 201,722
Fuel Service [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 312,888 321,374
Cost of products and services sold 212,035 223,991
Depreciation and amortization 37,093 33,951
Cost of sales 249,128 257,942
Gross profit 63,760 63,432
Administration 0 0
Impairment loss recognised in profit or loss, property plant and equipment 0 0
Exploration 0 0
Research and development 0 0
Other operating expense (income) 0 0
Loss on disposal of assets 247 221
Finance costs 0 0
Gain on derivatives 0 0
Finance income 0 0
Other income 0 (10,372)
Loss before income taxes 63,513 73,583
Capital expenditures for the year 11,237 13,983
NUKEM [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue 321,188 391,402
Cost of products and services sold 321,362 380,695
Depreciation and amortization 14,193 38,273
Cost of sales 335,555 418,968
Gross profit (14,367) (27,566)
Administration 12,439 20,088
Impairment loss recognised in profit or loss, property plant and equipment 111,399 0
Exploration 0 0
Research and development 0 0
Other operating expense (income) 0 0
Loss on disposal of assets 799 160
Finance costs 1,479 4,056
Gain on derivatives 1,945 (6,530)
Finance income (23) (396)
Other income 1,263 329
Loss before income taxes (143,668) (45,273)
Capital expenditures for the year 23 1,203
Other Segment [Member]    
Disclosure Of Operating Segments [Line Items]    
Revenue (51,292) 732
Cost of products and services sold (53,849) (1,463)
Depreciation and amortization 11,128 18,306
Cost of sales (42,721) 16,843
Gross profit (8,571) (16,111)
Administration 150,656 186,564
Impairment loss recognised in profit or loss, property plant and equipment 0 0
Exploration 0 0
Research and development 5,660 4,952
Other operating expense (income) 0 0
Loss on disposal of assets 0 0
Finance costs 109,129 107,850
Gain on derivatives (58,195) (27,877)
Finance income (5,242) (3,983)
Other income 21,954 5,591
Loss before income taxes (232,533) (289,208)
Capital expenditures for the year $ 0 $ 0