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Income taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits |  |  |
Balance at beginning of year | $ 1,798 | $ 3,001 | $ 721
Additions for acquired unrecognized tax benefits | 11,244 | 0 | 0
Increases for tax positions taken in current year | 300 | 770 | 2,280
Decreases for tax positions taken in current year | (700) | (1,973) | 0
Balance at end of year | $ 12,642 | $ 1,798 | $ 3,001

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from acquisitions. + References No definition available. + Details
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