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Financial instruments - Fair value measurement of financial assets and liabilities (Details) - At fair value - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | $ 197,727 | $ 32,777
FVTE |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 1,694,100 | 1,806,999
FVOCI |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 272,294 | 250,684
Derivative financial assets | 3,346 | 7,699
Cash and cash equivalents | FVTE | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 864,209 | 1,461,145
Cash included in funds held for clients (Note 5) | FVTE | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 704,503 | 233,584
Deferred compensation plan assets (Note 11) | FVTE | Level 1 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 125,388 | 112,270
Short-term investments included in current financial assets | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 3,675 | 3,279
Long-term bonds included in funds held for clients (Note 5) | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 240,932 | 223,196
Long-term investments (Note 11) | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 27,687 | 24,209
Cross-currency swaps | Current derivative financial instruments included in current financial assets | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | 3,036 | 0
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | 136,155 | 9,500
Cross-currency swaps | Current derivative financial instruments included in current financial assets | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 1,011 | 0
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 395 | 0
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | 21,586 | 13,073
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | 36,950 | 10,204
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 1,481 | 5,055
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | FVOCI | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | $ 459 | $ 2,644

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35N&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 + Details
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