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Other liabilities (Narrative) (Details) - Product Loan [Member]	12 Months Ended
	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

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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

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ccj_ProductLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=ccj_Uf6Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: