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Financial Instruments - Aging of trade receivables (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | $ 321,638 | $ 392,865
Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 314,240 |
Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 7,398 |
Current (not past due) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 279,555 |
Current (not past due) | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 274,249 |
Current (not past due) | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 5,306 |
1-30 days past due |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 40,911 |
1-30 days past due | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 39,690 |
1-30 days past due | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 1,221 |
More than 30 days past due |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 1,172 |
More than 30 days past due | Corporate customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | 301 |
More than 30 days past due | Other customers [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade receivables | $ 871 |

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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 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_68&doctype=Standard -URIDate 2019-03-27 + 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
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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: |