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Property, plant and equipment (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | $ 4,191,892 |
Impairment charges |  | 0 | $ 358,330
Property, plant and equipment - End of year |  | 3,881,926 | 4,191,892
Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 9,140,575 | 9,176,181
Additions |  | 55,362 | 143,333
Transfers |  | 0 | 0
Change in reclamation provision |  | 132,317 | 17,541
Disposals |  | (14,332) | (88,473)
JV Inkai restructuring | [1] | (367,993) |
Pre-commerical production revenue | [2] |  | (29,305)
Effect of movements in exchange rates |  | 63,532 | (78,702)
Property, plant and equipment - End of year |  | 9,009,461 | 9,140,575
Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 4,948,683 | 4,520,595
Depreciation charge |  | 235,436 | 320,154
Transfers |  | 0 | 0
Change in reclamation provision |  | 59,616 | 43
Disposals |  | (10,685) | (79,951)
JV Inkai restructuring | [1] | (167,143) |
Impairment charges | [3],[4] |  | 239,781
Effect of movements in exchange rates |  | 61,628 | (51,939)
Property, plant and equipment - End of year |  | 5,127,535 | 4,948,683
Land and buildgings [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,327,863 |
Property, plant and equipment - End of year |  | 2,254,871 | 2,327,863
Land and buildgings [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 5,045,112 | 4,979,489
Additions |  | 1,944 | 27,343
Transfers |  | 104,760 | 104,134
Change in reclamation provision |  | 132,317 | 17,541
Disposals |  | (186) | (4,610)
JV Inkai restructuring | [1] | (245,882) |
Pre-commerical production revenue | [2] |  | (22,818)
Effect of movements in exchange rates |  | 51,843 | (55,967)
Property, plant and equipment - End of year |  | 5,089,908 | 5,045,112
Land and buildgings [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,717,249 | 2,508,212
Depreciation charge |  | 120,754 | 137,853
Transfers |  | 13,036 | 48,209
Change in reclamation provision |  | 59,616 | 43
Disposals |  | (185) | (2,393)
JV Inkai restructuring | [1] | (123,919) |
Impairment charges | [3],[4] |  | 67,535
Effect of movements in exchange rates |  | 48,486 | (42,210)
Property, plant and equipment - End of year |  | 2,835,037 | 2,717,249
Plant and equipment [member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 1,118,175 |
Property, plant and equipment - End of year |  | 957,766 | 1,118,175
Plant and equipment [member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,729,635 | 2,640,543
Additions |  | 7,274 | 13,649
Transfers |  | 20,044 | 106,669
Change in reclamation provision |  | 0 | 0
Disposals |  | (7,355) | (4,803)
JV Inkai restructuring | [1] | (109,748) |
Pre-commerical production revenue | [2] |  | (6,487)
Effect of movements in exchange rates |  | 15,094 | (19,936)
Property, plant and equipment - End of year |  | 2,654,944 | 2,729,635
Plant and equipment [member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 1,611,460 | 1,460,953
Depreciation charge |  | 111,465 | 175,811
Transfers |  | 6,333 | (35,243)
Change in reclamation provision |  | 0 | 0
Disposals |  | (5,853) | (4,130)
JV Inkai restructuring | [1] | (38,783) |
Impairment charges | [3],[4] |  | 25,359
Effect of movements in exchange rates |  | 12,556 | (11,290)
Property, plant and equipment - End of year |  | 1,697,178 | 1,611,460
Furniture and fixtures [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 10,065 |
Property, plant and equipment - End of year |  | 5,223 | 10,065
Furniture and fixtures [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 90,817 | 95,168
Additions |  | 0 | 3,521
Transfers |  | 288 | (2,455)
Change in reclamation provision |  | 0 | 0
Disposals |  | (4,714) | (4,578)
JV Inkai restructuring | [1] | (6,624) |
Pre-commerical production revenue | [2] |  | 0
Effect of movements in exchange rates |  | 316 | (839)
Property, plant and equipment - End of year |  | 80,083 | 90,817
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 80,752 | 80,592
Depreciation charge |  | 3,217 | 6,490
Transfers |  | (322) | (2,451)
Change in reclamation provision |  | 0 | 0
Disposals |  | (4,647) | (3,269)
JV Inkai restructuring | [1] | (4,441) |
Impairment charges | [3],[4] |  | 0
Effect of movements in exchange rates |  | 301 | (610)
Property, plant and equipment - End of year |  | 74,860 | 80,752
Under constructions [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 98,899 |
Property, plant and equipment - End of year |  | 26,666 | 98,899
Under constructions [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 154,731 | 340,340
Additions |  | 45,516 | 97,729
Transfers |  | (129,436) | (208,359)
Change in reclamation provision |  | 0 | 0
Disposals |  | (1,663) | (74,482)
JV Inkai restructuring | [1] | (5,739) |
Pre-commerical production revenue | [2] |  | 0
Effect of movements in exchange rates |  | 56 | (497)
Property, plant and equipment - End of year |  | 63,465 | 154,731
Under constructions [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 55,832 | 80,674
Depreciation charge |  | 0 | 0
Transfers |  | (19,047) | (10,515)
Change in reclamation provision |  | 0 | 0
Disposals |  | 0 | (70,159)
JV Inkai restructuring | [1] | 0 |
Impairment charges | [3],[4] |  | 55,841
Effect of movements in exchange rates |  | 14 | (9)
Property, plant and equipment - End of year |  | 36,799 | 55,832
Exploration and evaluation [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 636,890 |
Property, plant and equipment - End of year |  | 637,400 | 636,890
Exploration and evaluation [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 1,120,280 | 1,120,641
Additions |  | 628 | 1,091
Transfers |  | 4,344 | 11
Change in reclamation provision |  | 0 | 0
Disposals |  | (414) | 0
JV Inkai restructuring | [1] | 0 |
Pre-commerical production revenue | [2] |  | 0
Effect of movements in exchange rates |  | (3,777) | (1,463)
Property, plant and equipment - End of year |  | 1,121,061 | 1,120,280
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 483,390 | 390,164
Depreciation charge |  | 0 | 0
Transfers |  | 0 | 0
Change in reclamation provision |  | 0 | 0
Disposals |  | 0 | 0
JV Inkai restructuring | [1] | 0 |
Impairment charges | [3],[4] |  | 91,046
Effect of movements in exchange rates |  | 271 | 2,180
Property, plant and equipment - End of year |  | $ 483,661 | $ 483,390
[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 ).
[2] | During 2017, revenues of $ 29,305,000 from the sales of inventories before the commencement of commercial production of JV Inkai Bloc k 3 were recorded as a reduction of the respective mining assets.
[3] | Also in the fourth quarter of 2017, Cameco announced the planned temporary suspension of production at the McArthur River/Key Lake operation. Due to this announcement, the Key Lake calciner project, which is part of the uranium segment and was initially undertaken to allow for an increase in annual production, was re-evaluated. As a result, the Company wrote off $ 55,333,000 of assets under construction on this project.
[4] | In the fourth quarter of 2017, all remaining proven and probable reserves of our US operations were reclassified to resources, indicating that the mineable remaining pounds of U 3 O 8 no l onger had demonstrated economic viability, but had reasonable prospects for economic extraction. In accordance with the provisions of IAS 36, Impairment of Assets , Cameco considered this to be an indicator that the assets of the two cash generating units i n the US could potentially be impaired and accordingly, we were required to estimate the recoverable amount of these assets. An impairment charge of $ 184,448,000 ($ 144,450,000 (USD)) was recognized as part of the uranium segment. The amount of the charge w as determined as the excess of the carrying value over the recoverable amount which was based on a fair value less costs to sell model and categorized as a non-recurring level 3 fair value measurement. The recoverable amount was determined to be $ 133,228,0 00 ($ 106,200,000 (USD)) based on the fair value of resources in place using comparable market metrics.

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- Definition The amount of revenue which is arises from selling pre-commerical production inventory, during the period of testing of the mine plant and equipment and the mine is yet to be transferred to operations. + References No definition available. + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + Details
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