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Commitments and contingencies - Legal Proceedings - Additional Information (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($) claims | Sep. 30, 2023 USD ($) claims
Aggregate Arbitrations with Claimed Damages | Popular Securities |  |
Legal Matters And Contingencies [Line Items] |  |
Loss contingency pending claims number | claims |  | 6
Loss Contingency settled claims number | claims |  | 5
Loss contingency claims dismissed number | claims |  | 2
Loss Contingency Damages Sought Value | $ |  | $ 5,880
Aggregate Arbitrations with Claimed Damages | Popular Securities | Subsequent event |  |
Legal Matters And Contingencies [Line Items] |  |
Loss contingency pending claims number | claims | 1 |
Litigation settlement amount awarded to other party | $ | $ 1,300 |
Minimum |  |
Legal Matters And Contingencies [Line Items] |  |
Loss Contingency Range Of Possible Loss Portion Not Accrued | $ |  | 0
Maximum |  |
Legal Matters And Contingencies [Line Items] |  |
Loss Contingency Range Of Possible Loss Portion Not Accrued | $ |  | $ 18,400

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- Definition Number of claims dismissed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
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