Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenue		$ 465,910	$ 457,721
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	417,110	405,125
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		13,244	8,468
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 35,556	$ 44,128

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