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Revenue - Narrative (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenue [abstract] |  |
Revenue From Performance Obligations Satisfied Or Partially Satisfied In Previous Periods |  | $ 78,000
Explanation Of Effect That Timing Of Satisfaction Of Performance Obligations And Typical Timing Of Payment Have On Contract Assets And Contract Liabilities Explanatory | The revenue related to the fuel fabricati on services and storage is recognized over time while the revenue related to future conversion deliveries is expected to be recognized between 20 21 and 20 27. |
Statement That Practical Expedient About Incremental Costs Of Obtaining Contract Has Been Used | Cameco expenses the incremental costs of obtaining a contract as incurred as the amortization period is less than a year. |
Disclosure Of Information About Methods Inputs And Assumptions Used For Determining Transaction Price Explanatory | Cam eco’s sales portfolio consists of sho rt and long-term sales commitments. The contracts can be executed well in advance of a delivery and include both fixed and market-related pricing. |
ExplanationOfWhetherAnyConsiderationFromContractsWithCustomersIsNotIncludedInDisclosureOfTransactionPriceAllocatedToRemainingPerformanceObligations | Cameco’s total revenue that will be earned will also include revenue from contracts with market-related pricing. The Company has elected to exclude these amounts from the table as the transaction price will not be known until the time of delivery. |
Reduction Of Revenue From Performance Obligation | $ 268,000 |

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- Definition The disclosure of information about the methods, inputs and assumptions used for determining the transaction price in contracts with customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 126 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_126_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The explanation of the effect that the timing of satisfaction of performance obligations and the typical timing of payment have on the contract assets and the contract liabilities. [Refer: Performance obligations [member]; Contract assets; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 117 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_117&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The explanation of whether any consideration from contracts with customers is not included in the disclosure of the transaction price allocated to the remaining performance obligations. [Refer: Transaction price allocated to remaining performance obligations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 122 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_122&doctype=Standard -URIDate 2020-01-01 + Details
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