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Income Taxes - Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance, beginning of period | $ 86,877 | $ 79,167 | $ 66,840
Gross increases related to prior period tax positions | 5,292 | 7,939 | 4,270
Gross decreases related to prior period tax positions | (2,381) | (7,659) | (70)
Gross increases related to current period tax positions | 10,244 | 8,494 | 9,224
Decreases relating to settlements with tax authorities | 0 | (50) | (300)
Reductions due to lapses of statute of limitations | (13,435) | (1,014) | (797)
Balance, end of period | $ 86,597 | $ 86,877 | $ 79,167

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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