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Share-based compensation plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 CAD ($) shares Number_employees $ / shares | Dec. 31, 2018 CAD ($) shares Number_employees $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Stock options held | 6,290,380 | 6,007,557
Options exercisable - Weighted average exercisable price | $ / shares | $ 18.9 | $ 22.83
Modification of sharebased payments restricted and performance shares | $ | $ (8,369,000) |
Stock Option Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | The options carry vesting periods of one to three years, and expire eight years from the date granted |
Authorized shares | 43,017,198 |
Outstanding shares | 27,875,289 |
Performance Share Unit Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Stock options held | 1,465,618 | 1,343,971
Options exercisable - Weighted average exercisable price | $ / shares | $ 0 |
Restricted Share Unit Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | The RSUs carry vesting periods of one to three years |
Stock options held | 443,274 | 456,704
Employee Share Ownership Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | Shares purchased with Company contributions and with dividends paid on such shares become unrestricted 12 months from the date on which such shares were purchased |
Employers contribution per employee | Under the plan, employees have the opportunity to participate in the program to a maximum of 6% of eligible earnings each year with Cameco matching the first 3% of employee-paid shares by 50%. Cameco contributes $1,000 of shares annually to each employee that is enrolled in the plan |
Number of participants | Number_employees | 2,253 | 2,317
Total number of shares purchased | 235,915 | 304,147
Total amount of employer's contribution | $ | $ 3,127,000 | $ 3,845,000
Deferred Share Unit Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | Each DSU fully vests upon award |
Stock options held | 474,266 | 528,483
Description of method of settlement for share-based payment arrangement | 60% of each director’s annual retainer is paid in DSUs. In addition, on an annual basis, directors can elect to receive 25%, 50%, 75% or 100% of the remaining 40% of their annual retainer and any additional fees in the form of DSUs |
Phantom Stock Option Plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Vesting period | vest over three years and expire eight years from the date granted |
Stock options held | 406,270 | 353,580
Options exercisable - Weighted average exercisable price | $ / shares | $ 16.48 | $ 17.74
Phantom Stock Option Plan [member] | Bottom of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise prices range | $ / shares | 11.32 | 11.32
Phantom Stock Option Plan [member] | Top of range [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise prices range | $ / shares | $ 26.81 | $ 39.53
Cash Settled Plan [Member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Liabilities from share-based payment transactions | $ | $ 14,577,000 | $ 9,352,000

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- Definition A modification to equity resulting from share-based payment restricted and performance share units. + References No definition available. + Details
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- Definition The description of the method of settlement (for example, whether in cash or equity) for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The exercise price of outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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