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v3.24.1

Other liabilities (Standby product loan facilities with various counterparties) (Details) - Product Loan [Member] | Dec. 31, 2023 lb kg | Dec. 31, 2022 lb kg
--- | --- | ---
UF6 conversion services [member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | kg | 1,777,000 | 1,529,000
UF6 conversion services [member] | 2024 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 0 |
UF6 conversion services [member] | 2025 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 528,000 |
UF6 conversion services [member] | 2026 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 1,249,000 |
U3O8 [member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 2,756,000 | 1,393,000
U3O8 [member] | 2024 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 0 |
U3O8 [member] | 2025 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 630,000 |
U3O8 [member] | 2026 [Member] |  |
Quantity of uranium drawn [Line Items] |  |
Product loans drawn | 2,126,000 |

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- Definition Quantity of product loans outstanding at reporting date. + References No definition available. + Details
Name: | ccj_OtherBorrowingsQuantity
Namespace Prefix: | ccj_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=ccj_UraniumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |