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Financial instruments - Disclosure of analysis of age of trade accounts receivable (Details) - CAD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ 1,343,282,000 | $ 1,117,712,000
Cost |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 1,349,436,000 | 1,120,772,000
Cost | Not past due |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 1,195,658,000 | 1,005,651,000
Cost | Past due 1-30 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 92,167,000 | 71,445,000
Cost | Past due 31-60 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 24,089,000 | 18,352,000
Cost | Past due 61-90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 11,284,000 | 11,957,000
Cost | Past due more than 90 days |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | 26,238,000 | 13,367,000
Allowance for doubtful accounts |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Trade receivables | $ (6,154,000) | $ (3,060,000)

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