Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue		$ 542,181	$ 505,227	$ 1,008,091	$ 962,948
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	492,143	452,710	909,253	857,835
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		8,921	9,540	22,165	18,008
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 41,117	$ 42,977	$ 76,673	$ 87,105

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