Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue		$ 518,639	$ 542,342	$ 1,671,925	$ 1,550,433
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	481,559	498,410	1,551,600	1,407,662
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		7,050	8,251	22,243	30,417
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 30,030	$ 35,681	$ 98,082	$ 112,354

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