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Other liabilities (Narrative) (Details) - Product Loan [Member] | 12 Months Ended
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Dec. 31, 2020 lb kg
Range [member] |
Disclosure of detailed information about product loans [line items] |
Product loan maturity | December 31, 2023
Bottom of range [member] |
Disclosure of detailed information about product loans [line items] |
Interest rate | 0.50%
Top of range [member] |
Disclosure of detailed information about product loans [line items] |
Standby interest rate | 1.00%
Interest rate | 2.00%
Uranium [Member] | Range [member] |
Disclosure of detailed information about product loans [line items] |
Product loans received | lb | 1,213,800
Uranium [Member] | Top of range [member] |
Disclosure of detailed information about product loans [line items] |
Available quantity | lb | 2,600,000
UF6 [Member] | Range [member] |
Disclosure of detailed information about product loans [line items] |
Product loans received | kg | 464,600
UF6 [Member] | Top of range [member] |
Disclosure of detailed information about product loans [line items] |
Available quantity | kg | 2,000,000

X
- Definition Total available standby product loan facility to the corporation. + References No definition available. + Details
Name: | ccj_AvailableLoanPayableQuantity
Namespace Prefix: | ccj_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

X
- Definition Standyby interest rate of product loan facility when the borrowing is not drawn upon. + References No definition available. + Details
Name: | ccj_BorrowingsStandbyInterestRate
Namespace Prefix: | ccj_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Quantity of product loans received during the year. + References No definition available. + Details
Name: | ccj_OtherBorrowingsQuantity
Namespace Prefix: | ccj_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |