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Cost optimization program (Details) - CAD ($) | 12 Months Ended | 18 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Cost optimization program | $ 91,063,000 | $ 8,964,000 | $ 100,027,000
Cost optimization program |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Termination of employment costs | 69,500,000 | 2,613,000 |
Cost of vacating leased premises | 21,563,000 | 6,351,000 |
Impairment of right-of-use assets | 10,119,000 | 2,232,000 |
Onerous contracts expense | 9,013,000 | 2,181,000 |
Impairment loss | $ 2,431,000 | $ 1,938,000 |

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for right-of-use assets. [Refer: Impairment loss recognised in profit or loss; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 171 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_171&doctype=Standard -URIDate 2024-03-27 + Details
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