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Income Taxes - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits |  |  |
Balance at beginning of year | $ 12,642 | $ 1,798 | $ 3,001
Additions for acquired unrecognized tax benefits | 0 | 11,244 | 0
Decreases for lapse of statue of limitations | (1,412) | 0 | 0
Decreases for settlements with taxing authorities | (4,785) | 0 | 0
Increases for tax positions taken in current year | 2,231 | 300 | 770
Decreases for tax positions taken in current year | 0 | (700) | (1,973)
Balance at end of year | $ 8,676 | $ 12,642 | $ 1,798

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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 https://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 https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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