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Investments in subsidiaries - Narrative (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Jul. 29, 2022 | Jul. 18, 2022 | May 31, 2022 | May 25, 2022 | Feb. 28, 2022 | Oct. 28, 2021 | Oct. 01, 2021 | May 03, 2021 | Dec. 31, 2020
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | $ 658,618 | $ 111,513 |  |  |  |  |  |  |  |  |
Consideration paid | 639,192 | 104,148 |  |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period | 600,000 |  |  |  |  |  |  |  |  |  |
Profit (loss) of combined entity as if combination occurred at beginning of period | 43,000 |  |  |  |  |  |  |  |  |  |
Expenses for acquisition-related and integration costs | 27,654 | 7,371 |  |  |  |  |  |  |  |  |
Acquisition-related costs | 3,094 | 293 |  |  |  |  |  |  |  |  |
Integration costs | 24,560 | 7,078 |  |  |  |  |  |  |  |  |
Termination of employment costs | 10,948 | 1,008 |  |  |  |  |  |  |  |  |
Other integration costs | 13,612 | $ 6,070 |  |  |  |  |  |  |  |  |
Array Holding Company, Inc |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  |  | $ 60,337 |  |
CMC |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | 90,900 |  |  |  |  |  |  | $ 90,900 |  |  |
Consideration paid | 79,291 |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition date | 112,000 |  |  |  |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date | 5,000 |  |  |  |  |  |  |  |  |  |
Unico Computer Systems Pty Ltd |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  | $ 39,814 |  |  |  |
Harwell Management |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  | $ 47,309 |  |  |  |  |
Umanis |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) | 420,258 |  |  |  | $ 303,896 |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 90.00% | 72.40% |  |  |  |  |  |
Consideration paid | 420,258 |  | $ 116,362 |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition date | 113,000 |  |  |  |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date | 9,000 |  |  |  |  |  |  |  |  |  |
Harris, Mackessy & Brennan, Inc |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  |  |  |  | $ 30,340
Sense Corp |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets acquired (liabilities assumed) |  |  |  |  |  |  |  |  |  | $ 81,173 |
Prior fiscal year acquisitions |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid | $ 4,700 |  |  |  |  |  |  |  |  |  |

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