Commitments and contingencies - Legal Proceedings - Additional Information (Details) $ in Thousands	3 Months Ended
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

Legal Matters And Contingencies [Line Items]

No definition available.

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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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

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Number of claims settled.

+ References

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: 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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 3: 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

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

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- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ 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 (b)
-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 (b)
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

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