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Financial instruments - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) | $ (81,081,000) |  | $ 56,250,000 |  |
Cash and cash equivalents | 711,528,000 |  | 591,620,000 |  | $ 320,278,000
Short-term investments | 391,025,000 |  | 0 |  |
Amount of receivables sold | 0 |  | $ 120,470,000 | $ 92,805,000 |
Pledged cash as security | $ 191,188,000 |  |  |  |
Quoted market yields | 1.70% | 1.70% |  |  |
Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Quoted market yields | 1.90% | 1.90% | 1.60% | 1.60% |
Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Quoted market yields | 2.20% | 2.20% | 2.30% | 2.30% |
Interest rate swap contracts [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) | $ 2,032,000 |  | $ (4,014,000) |  |
Credit risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | 711,528,000 |  | 591,620,000 |  |
Short-term investments | $ 391,025,000 |  | $ 0 |  |
Interest rate risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Proportion of outstanding debt that carries fixed rate | 67.00% | 67.00% | 80.00% | 80.00% |
Interest rate risk [member] | Interest rate swap contracts [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Fair value of Cameco's interest rate swap assets | $ 856,000 |  | $ (150,000) |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series D senior unsecured debenture [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | $ 350,000,000 |  |  |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series D senior unsecured debenture [member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Interest rate basis | the three-month Canada Dealer Offered Rate | the three-month Canada Dealer Offered Rate |  |  |
Margin rate | 3.60% |  |  |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series D senior unsecured debenture [member] | Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Interest rate | 5.67% |  |  |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series E senior unsecured debenture [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | $ 150,000,000 |  |  |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series E senior unsecured debenture [Member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Interest rate basis | the three-month Canada Dealer Offered Rate | the three-month Canada Dealer Offered Rate |  |  |
Margin rate | 1.20% |  |  |  |
Interest rate risk [member] | Interest rate swap contracts [member] | Series E senior unsecured debenture [Member] | Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Interest rate | 3.75% |  |  |  |
Commodity price risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Percentage increase (decrease) in commodity price | 30.00% | 30.00% |  |  |
Gain (loss) | $ (3,103,000) | $ (2,404,000) |  |  |

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