Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Revenue		$ 636,366	$ 603,072	$ 1,201,494	$ 1,153,286
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	601,549	564,014	1,125,860	1,070,041
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		5,836	6,753	15,241	15,193
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 28,981	$ 32,305	$ 60,393	$ 68,052

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