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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | $ 780,370 | $ 695,495 | $ 2,277,982 | $ 2,069,446
United States |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 411,093 | 361,820 | 1,192,270 | 1,075,742
Other Americas [Member] |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 19,878 | 21,026 | 66,800 | 69,059
Total Americas |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 430,971 | 382,846 | 1,259,070 | 1,144,801
EMEA |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | 202,073 | 190,661 | 620,431 | 562,410
APAC |  |  |  |
Schedule of Revenues by Geographic Region [Line Items] |  |  |  |
Revenue from contract with customer, excluding assessed tax | $ 147,326 | $ 121,988 | $ 398,481 | $ 362,235

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