Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,739,226	$ 2,298,472	$ 2,097,053
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	2,600,514	2,134,030	1,907,918
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		31,375	32,196	38,640
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 107,337	$ 132,246	$ 150,495

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