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Financial instruments - Fair value measurement of financial assets and liabilities (Details) - At fair value - CAD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial liabilities | $ 6,213 | $ 12,190
FVTE |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 1,926,159 | 1,543,047
Derivative financial instruments designated as hedging instruments |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 163,380 | 117,123
Derivative financial assets | 118,136 | 265,551
Cash and cash equivalents | FVTE | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 1,568,291 | 966,458
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 | 269,792 | 504,726
Deferred compensation plan assets (Note 11) | FVTE | Level 1 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 88,076 | 71,863
Short-term investments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 7,332 | 6,184
Long-term bonds included in funds held for clients (Note 5) | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 138,935 | 94,113
Long-term investments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Financial assets | 17,113 | 16,826
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 | 2,183 | 599
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 | 0 | 1,086
Cross-currency swaps | Current derivative financial instruments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 83,626 | 8,740
Cross-currency swaps | Long-term derivative financial instruments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 16,130 | 222,246
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 | 2,330 | 5,710
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 | 1,700 | 4,795
Foreign currency forward contracts | Current derivative financial instruments included in current financial assets | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | 12,505 | 18,934
Foreign currency forward contracts | Long-term derivative financial instruments (Note 11) | Derivative financial instruments designated as hedging instruments | Level 2 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Derivative financial assets | $ 5,875 | $ 15,631

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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 -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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 -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + 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: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35M&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35N&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35I&doctype=Standard -URIDate 2023-03-23 + Details
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