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Summary of significant accounting policies - Narrative (Details) - CAD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Disclosure of voluntary change in accounting policy [line items] |  |
Funds held for clients | $ 598,839 | $ 593,154
Cash and cash equivalents |  |
Disclosure of voluntary change in accounting policy [line items] |  |
Funds held for clients | $ 504,726 | $ 456,525

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- Definition The amount in the consolidated financial statements of the assets of the group to which significant restrictions (for example, statutory, contractual and regulatory restrictions) apply on the entity's ability to access or use the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph 13 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_13_c&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |