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Segment Information - Revenues by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	$ 3,088,072	$ 2,816,120	$ 2,813,169
United States
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	1,631,180	1,488,413	1,487,416
Other Americas
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	92,889	92,859	96,958
Total Americas
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	1,724,069	1,581,272	1,584,374
EMEA
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	827,168	755,934	741,598
APAC
Schedule of Revenues by Geographic Region [Line Items]
Net revenues	$ 536,835	$ 478,914	$ 487,197

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