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Segment Information - Summary of Revenue and Long-lived Assets by Geographical Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenue:
Revenue, Total	$ 2,309,288	$ 2,431,008	$ 2,394,706
Long-lived assets, net:
Long-lived assets, net, Total	690,461	669,365
United States [Member]
Revenue:
Revenue, Total	2,165,557	2,309,895	2,284,485
Long-lived assets, net:
Long-lived assets, net, Total	586,784	563,351
International [Member]
Revenue:
Revenue, Total	143,731	121,113	$ 110,221
Long-lived assets, net:
Long-lived assets, net, Total	$ 103,677	$ 106,014

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