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Financial instruments - Measurement of fair values (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents |  | $ 918,382 | $ 1,062,431 | $ 711,528
Short-term investments |  | 24,985 | 0 |
Derivative assets |  | 45,605 | 10,504 |
Accounts receivable |  | 204,980 | 328,044 |
Investments in equity securities | [1] | 43,873 | 24,408 |
Financial assets |  | 1,237,825 | 1,425,387 |
Financial liabilities [Abstract] |  |  |  |
Accounts payable and accrued liabilities |  | 233,649 | 181,799 |
Lease obligation |  | 7,951 | 12,869 |
Derivative liabilities |  | 4,733 | 12,524 |
Long-term debt |  | 995,541 | 996,718 |
Financial liabilities |  | 1,241,874 | 1,203,910 |
Net |  | (4,049) | 221,477 |
Foreign currency contracts [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 45,605 | 8,191 |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 4,733 | 12,524 |
Interest rate contracts [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 0 | 2,313 |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 0 |
Fair value through profit or loss [member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Financial liabilities |  | 4,733 | 12,524 |
Net |  | 40,872 | (2,020) |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 4,733 | 12,524 |
Fair value through profit or loss [member] | Interest rate contracts [member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 0 |
Financial liabilities at amortised cost category [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Accounts payable and accrued liabilities |  | 233,649 | 181,799 |
Lease obligation |  | 7,951 | 12,869 |
Long-term debt |  | 995,541 | 996,718 |
Financial liabilities |  | 1,237,141 | 1,191,386 |
Net |  | (88,794) | 199,089 |
Fair value through profit or loss [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Financial assets |  | 45,605 | 10,504 |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 45,605 | 8,191 |
Fair value through profit or loss [member] | Interest rate contracts [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 0 | 2,313 |
Financial assets at amortised cost category [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 918,382 | 1,062,431 |
Short-term investments |  | 24,985 | 0 |
Accounts receivable |  | 204,980 | 328,044 |
Financial assets |  | 1,148,347 | 1,390,475 |
Financial liabilities [Abstract] |  |  |  |
Net |  | (88,794) | 199,089 |
Investments in equity instruments measured at FVOCI [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Investments in equity securities |  | 43,873 | 24,408 |
Financial assets |  | 43,873 | 24,408 |
Financial liabilities [Abstract] |  |  |  |
Net |  | $ 43,873 | $ 24,408 |
[1] | At January 1, 2018, Cameco designated the investments shown below as equity securities at FVOCI because these equity securities represent investments that the Company intends to hold for the long term for strategic purposes . There were no dividends recognized on any of these investments during the year.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35M&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + Details
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