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Financial instruments - Measurement of fair values hierarchy levels (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | $ 45,605 | $ 10,504
Investments in equity securities | [1] | 43,873 | 24,408
Derivative liabilities |  | (4,733) | (12,524)
Long-term debt |  | (995,541) | (996,718)
Net financial instruments |  | (910,796) | (974,330)
Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 45,605 | 8,191
Derivative liabilities |  | (4,733) | (12,524)
Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 0 | 2,313
Derivative liabilities |  | 0 | 0
Level 1 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in equity securities |  | 43,873 | 24,408
Net financial instruments |  | 43,873 | 24,408
Level 2 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt |  | (1,173,280) | (1,111,923)
Net financial instruments |  | (1,132,408) | (1,113,943)
Level 2 of fair value hierarchy [member] | Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 45,605 | 8,191
Derivative liabilities |  | (4,733) | (12,524)
Level 2 of fair value hierarchy [member] | Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 0 | 2,313
Derivative liabilities |  | 0 | 0
Fair value [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in equity securities |  | 43,873 | 24,408
Long-term debt |  | (1,173,280) | (1,111,923)
Net financial instruments |  | (1,088,535) | (1,089,535)
Fair value [member] | Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 45,605 | 8,191
Derivative liabilities |  | (4,733) | (12,524)
Fair value [member] | Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 0 | 2,313
Derivative liabilities |  | $ 0 | $ 0
[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 Financial instruments contracts net of non current borrowings. + References No definition available. + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_h&doctype=Standard -URIDate 2020-01-01 + Details
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