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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($) | Sep. 30, 2023 | Sep. 30, 2022
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Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ (1,152,880,000) | $ (1,106,187,000)
Gross trade receivables | 1,155,799,000 | 1,109,647,000
Allowance for doubtful accounts | (2,919,000) | (3,460,000)
Not past due |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | (1,034,795,000) | (950,928,000)
Past due 1-30 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | (82,536,000) | (81,000,000)
Past due 31-60 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | (17,630,000) | (25,694,000)
Past due 61-90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | (9,925,000) | (12,142,000)
Past due more than 90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ (10,913,000) | $ (39,883,000)

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- Definition Allowance Account For Credit Losses Of Trade Receivables + References No definition available. + Details
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Namespace Prefix: | gib_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross Trade Receivables + References No definition available. + Details
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Namespace Prefix: | gib_
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 members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_b&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant

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