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Segment Information - Revenues by Geographic Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | $ 865,077 | $ 780,370 | $ 2,499,242 | $ 2,277,982
United States |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 453,985 | 411,093 | 1,251,500 | 1,192,270
Other Americas |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 24,578 | 19,878 | 73,722 | 66,800
Total Americas |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 478,563 | 430,971 | 1,325,222 | 1,259,070
EMEA |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 256,030 | 202,073 | 770,600 | 620,431
APAC |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | $ 130,484 | $ 147,326 | $ 403,420 | $ 398,481

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