Determination of fair values (Details)	Dec. 31, 2023 CAD ($)
Determination of fair value [Abstract]
Transfers between level 1, level 2, or level 3 during the period	$ 0

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

No definition available.

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