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Financial Instruments - Aging of trade receivables (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | $ 166,054 | $ 321,638
Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 161,456 |
Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 4,598 |
Current (not past due) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 162,929 |
Current (not past due) | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 159,280 |
Current (not past due) | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 3,649 |
1-30 days past due |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 567 |
1-30 days past due | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 133 |
1-30 days past due | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 434 |
More than 30 days past due |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 2,558 |
More than 30 days past due | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 2,043 |
More than 30 days past due | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | $ 515 |

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_68&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 domain members defined in one or many axes of the table. + References No definition available. + Details
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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
Name: | ccj_TypeOfCustomerAxis=ccj_OtherCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Balance Type: |
Period Type: |

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