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Investments in subsidiaries - Narrative (Details) - CAD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 13, 2024 | Jul. 03, 2024 | Oct. 10, 2023
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Net assets acquired | $ 390,249,000 | $ 390,249,000 |  |  |  |
Additional recognition, acquisition costs |  | 2,348,000 |  |  |  |
Expenses for acquisition-related and integration costs |  | 5,866,000 | $ 53,401,000 |  |  |
Integration costs |  |  | 53,401,000 |  |  |
Professional fees |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Acquisition-related costs |  | 2,437,000 |  |  |  |
Vacating leased premises |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Integration costs |  | 947,000 | 10,774,000 |  |  |
Redundancy costs |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Integration costs |  | 653,000 | 23,226,000 |  |  |
Other integration costs |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Integration costs |  | 1,829,000 | $ 19,401,000 |  |  |
Momentum Industries Holdings, LLC |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Net assets acquired |  |  |  |  |  | $ 53,341,000
Celero Solutions (Celero) |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Net assets acquired |  |  |  |  | $ 19,067,000 |
Aeyon |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Net assets acquired | 317,841,000 | 317,841,000 |  | $ 317,841,000 |  |
Revenue of combined entity as if combination occurred at beginning of period |  | 265,000,000 |  |  |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  | $ 8,000,000 |  |  |  |
Revenue of acquiree since acquisition date | 12,000,000 |  |  |  |  |
Profit (loss) of acquiree since acquisition date | $ 500,000 |  |  |  |  |

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