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Financial instruments - Measurement of fair values hierarchy levels (Details) - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | $ 3,881 | $ 40,804
Investments in equity securities | [1] | 28,916 | 21,417
Current portion of long-term debt |  | (499,599) | 0
Derivative liabilities |  | (61,387) | (23,414)
Long-term debt |  | (996,072) | (1,494,471)
Net financial instruments |  | (1,524,261) | (1,455,664)
Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 2,201 | 39,984
Derivative liabilities |  | (54,866) | (5,624)
Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 1,680 | 820
Derivative liabilities |  | (823) | (970)
Uranium contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities |  | (5,698) | (16,820)
Level 1 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in equity securities |  | 28,916 | 21,417
Net financial instruments |  | 28,916 | 21,417
Level 2 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current portion of long-term debt |  | (511,210) | 0
Long-term debt |  | (1,111,782) | (1,652,230)
Net financial instruments |  | (1,680,498) | (1,634,840)
Level 2 of fair value hierarchy [member] | Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 2,201 | 39,984
Derivative liabilities |  | (54,866) | (5,624)
Level 2 of fair value hierarchy [member] | Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 1,680 | 820
Derivative liabilities |  | (823) | (970)
Level 2 of fair value hierarchy [member] | Uranium contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities |  | (5,698) | (16,820)
Fair value [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in equity securities |  | 28,916 | 21,417
Current portion of long-term debt |  | (511,210) | 0
Long-term debt |  | (1,111,782) | (1,652,230)
Net financial instruments |  | (1,651,582) | (1,613,423)
Fair value [member] | Foreign currency contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 2,201 | 39,984
Derivative liabilities |  | (54,866) | (5,624)
Fair value [member] | Interest rate contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets |  | 1,680 | 820
Derivative liabilities |  | (823) | (970)
Fair value [member] | Uranium contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities |  | $ (5,698) | $ (16,820)
[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 . In 2017, these investments were classified as available-for-sale and measured through OCI under IAS 39 (see note 3 ). There were no dividends recognized on any of these investments during the year.

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- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_11A_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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