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Financial instruments - Measurement of fair values (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents |  | $ 1,062,431 | $ 711,528 | $ 591,620
Short-term investments |  | 0 | 391,025 |
Derivative assets |  | 10,504 | 3,881 |
Accounts receivable |  | 328,044 | 402,350 |
Investments in equity securities | [1] | 24,408 | 28,916 |
Advances receivable from JV Inkai LLP |  | 0 | 124,533 |
Financial assets |  | 1,425,387 | 1,662,233 |
Financial liabilities [Abstract] |  |  |  |
Accounts payable and accrued liabilities |  | 181,799 | 224,754 |
Lease obligation |  | 12,869 | 0 |
Current portion of long-term debt |  | 0 | 499,599 |
Derivative liabilities |  | 12,524 | 61,387 |
Long-term debt |  | 996,718 | 996,072 |
Financial liabilities |  | 1,203,910 | 1,781,812 |
Net |  | 221,477 | (119,579) |
Foreign currency contracts [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 8,191 | 2,201 |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 12,524 | 54,866 |
Interest rate contracts [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 2,313 | 1,680 |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 823 |
Uranium contracts [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 5,698 |
Fair value through profit or loss [member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Financial liabilities |  | 12,524 | 61,387 |
Net |  | (2,020) | (57,506) |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 12,524 | 54,866 |
Fair value through profit or loss [member] | Interest rate contracts [member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 823 |
Fair value through profit or loss [member] | Uranium contracts [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Derivative liabilities |  | 0 | 5,698 |
Financial liabilities at amortised cost category [Member] |  |  |  |
Financial liabilities [Abstract] |  |  |  |
Accounts payable and accrued liabilities |  | 181,799 | 224,754 |
Lease obligation |  | 12,869 |  |
Current portion of long-term debt |  | 0 | 499,599 |
Long-term debt |  | 996,718 | 996,072 |
Financial liabilities |  | 1,191,386 | 1,720,425 |
Net |  | 199,089 | (90,989) |
Fair value through profit or loss [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Financial assets |  | 10,504 | 3,881 |
Fair value through profit or loss [member] | Foreign currency contracts [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 8,191 | 2,201 |
Fair value through profit or loss [member] | Interest rate contracts [member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Derivative assets |  | 2,313 | 1,680 |
Financial assets at amortised cost category [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 1,062,431 | 711,528 |
Short-term investments |  | 0 | 391,025 |
Accounts receivable |  | 328,044 | 402,350 |
Advances receivable from JV Inkai LLP |  | 0 | 124,533 |
Financial assets |  | 1,390,475 | 1,629,436 |
Financial liabilities [Abstract] |  |  |  |
Net |  | 199,089 | (90,989) |
Investments in equity instruments measured at FVOCI [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Investments in equity securities |  | 24,408 | 28,916 |
Financial assets |  | 24,408 | 28,916 |
Financial liabilities [Abstract] |  |  |  |
Net |  | $ 24,408 | $ 28,916 |
[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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