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Pension and other post-retirement benefits (Narrative) (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
2024 [Member]
Disclosure of fair value of plan [line items]
Contributions and fees payable	$ 2,174,000
Pension Plans [member]
Disclosure of fair value of plan [line items]
Weighted Average Length Of Time Of Defined Benefit Obligation	17 years 10 months 24 days	17 years 1 month 6 days
Pension Plans [member] | Increase of one year in the expected lifetime [member]
Disclosure of fair value of plan [line items]
Change in defined benefit obligations due to increase in actuarial assumption	$ 1,583,000
Other Benefit Plans [Member]
Disclosure of fair value of plan [line items]
Weighted Average Length Of Time Of Defined Benefit Obligation	11 years 4 months 24 days	11 years 3 months 18 days

X

- Definition

The length of time during which the defined and other benefit plans are active, in PnYnMn format.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccj_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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_
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Balance Type:	na
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X

- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 147
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_148_d_iii&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 145
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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X

- Details

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