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Investments in subsidiaries - Narrative (Details) - CAD ($) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Oct. 10, 2023 | Jul. 29, 2022 | Jul. 18, 2022 | May 31, 2022 | May 25, 2022 | Feb. 28, 2022 | Oct. 28, 2021 | Oct. 01, 2021
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | $ 658,618,000 |  |  |  |  |  |  |  |  |
Consideration paid | 639,192,000 |  |  |  |  |  |  |  |  |
Additional recognition, acquisition costs | 13,039,000 |  |  |  |  |  |  |  |  |
Expenses for acquisition-related and integration costs | 53,401,000 | $ 27,654,000 |  |  |  |  |  |  |  |
Termination of employment costs | 23,226,000 | 10,948,000 |  |  |  |  |  |  |  |
Other integration costs | 10,774,000 | 3,496,000 |  |  |  |  |  |  |  |
Acquisition-related costs |  | 3,094,000 |  |  |  |  |  |  |  |
Integration costs |  | $ 24,560,000 |  |  |  |  |  |  |  |
Umanis |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | 420,258,000 |  |  |  |  | $ 303,896,000 |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 90.00% | 72.40% |  |  |  |
Consideration paid | 420,258,000 |  |  | $ 116,362,000 |  |  |  |  |  |
Additional recognition, goodwill | 19,060,000 |  |  |  |  |  |  |  |  |
Momentum Industries Holdings, LLC | Major business combination |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  | $ 50,492,000 |  |  |  |  |  |  |
Array Holding Company, Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  |  |  | $ 60,337,000
CMC |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | 90,900,000 |  |  |  |  |  |  |  | $ 90,900,000 |
Consideration paid | $ 79,291,000 |  |  |  |  |  |  |  |  |
Unico Computer Systems Pty Ltd |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  | $ 39,814,000 |  |
Harwell Management |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  | $ 47,309,000 |  |  |

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