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Determination of fair values (Details)	Dec. 31, 2024 CAD ($)
Determination of fair value [Abstract]
Transfers between level 1, level 2, or level 3 during the period	$ 0

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- References

No definition available.

+ Details

Name:	ccj_FairValueMeasurementAbstract
Namespace Prefix:	ccj_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Transfers Between Level 1 Level 2 Or Level 3 Of Fair Value Hierarchy Assets And Liabilities

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No definition available.

+ Details

Name:	ccj_TransfersBetweenLevel1Level2OrLevel3OfFairValueHierarchyAssetsAndLiabilities
Namespace Prefix:	ccj_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant