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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($) | Sep. 30, 2024 | Sep. 30, 2023
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Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ 1,117,712,000 | $ 1,152,880,000
Cost |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 1,120,772,000 | 1,155,799,000
Cost | Not past due |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 1,005,651,000 | 1,034,795,000
Cost | Past due 1-30 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 71,445,000 | 82,536,000
Cost | Past due 31-60 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 18,352,000 | 17,630,000
Cost | Past due 61-90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 11,957,000 | 9,925,000
Cost | Past due more than 90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 13,367,000 | 10,913,000
Allowance for doubtful accounts |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ (3,060,000) | $ (2,919,000)

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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 2024-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_b&doctype=Standard -URIDate 2024-03-27 + Details
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