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Equity-accounted investee - Reconciliation of carrying amount (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Reconciliation [Abstract] |  |
Carrying amount in the statement of financial position, beginning of year before restructuring | $ 0 |
Carrying amount in the statement of financial position, end of year | 230,502 |
JV Inkai Associate [Member] |  |
Disclosure of significant investments in associates [Line Items] |  |
Cameco's share of net assets, beginning of year before restructuring | 236,857 |
Adjustments | (75,257) | [1]
Reconciliation [Abstract] |  |
Carrying amount in the statement of financial position, beginning of year before restructuring | 161,600 |
Share of net earnings | 26,525 |
Gain on restructuring | 43,120 |
Impact of foreign exchange | (6,539) |
Adjustments | 5,796 | [2]
Carrying amount in the statement of financial position, end of year | $ 230,502 |
[1] | In addition to its proportionate share of earnings from JV Inkai, Cameco records certain consolidating adjustments to eliminate unrealized profit and amortize historical diffe rences in accounting policies. This amount is amortized to earnings over units of production.
[2] | Following the restructuring, in addition to the adjustments noted in (a), Cameco also amortize s the fair values assigned to assets and liabilities at the time of the restructuring over units of production.

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- Definition Adjustment to entity's proportionate share of earnings such as eliminations for unrealized profit and amortisation of historical differences in accounting policies + References No definition available. + Details
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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, excluding impact of foreign currency translation reserve. + References No definition available. + Details
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- Definition Opening adjustment to entity's proportionate share of net assets such as eliminations for unrealized profit and amortization of historical differences in accounting policies + References No definition available. + Details
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- Definition Opening share of net assets of investments accounted for using equity method upon cessation of consolidation. + References No definition available. + Details
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- Definition Reconciliation of summarised financial information of associate accounted for using equity method to carrying amount of tnterest in associate + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in investment property resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_24_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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