Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,298,472	$ 2,097,053	$ 1,933,347
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	2,134,030	1,907,918	1,736,188
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		32,196	38,640	34,065
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 132,246	$ 150,495	$ 163,094

[1] Recurring revenue is comprised of on-premises subscription, perpetual support, SaaS, and hosting services revenue.