Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue		$ 542,342	$ 462,474	$ 1,550,433	$ 1,425,422
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	498,410	415,197	1,407,662	1,273,032
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		8,251	8,203	30,417	26,211
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 35,681	$ 39,074	$ 112,354	$ 126,179

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