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Other income (expense) - Narrative (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Other Income Expense [Abstract] |  |  |
Proportion of ownership interest in joint operation | 40.00% |  | 60.00%
Gain on restructuring of JV Inkai | $ 48,570,000 | [1] | $ 0
Reclassification of foreign currency translation reserve to net earnings | 5,450,000 |  | 0
Disclosure of financial assets [line items] |  |  |
Sale of exploration interests | 25,027,000 | [2] | $ 0
Denison [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Sale of exploration interests | $ 17,231,000 |  |
Number of shares owned | 24,615,000 |  |
[1] | Effective January 1, 2018, Cameco’s ownership interest in JV Inkai was reduced from 60 % to 40 % based on an implementation agreement with Kazatomprom. Cameco recognized a gain on the change in ownership interests of $ 48,570,000 . Included in this gain is $ 5,450,000 which has been reclassified from the foreign currency translation reserve to net earnings .
[2] | In the fourth quarter of 2018, Cameco sold its interest in the Wheeler River Joint Venture to Denison Mines Corp. in exchange for 24,615,000 commo n shares (note 10 ). Cameco recorded a gain of $ 17,231,000 on the transaction.

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- Definition The gain (loss) arising on the cessation of the consolidation of subsidiaries due to the change of investment entity status. [Refer: Disclosure of investment entities [text block]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 9B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_9B_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain on disposals of investment properties. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2018-01-01 -Paragraph 48 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=para_48&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard -URIDate 2018-03-16 + Details
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