Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation Of Revenue [Line Items]
Revenue		$ 774,303	$ 636,366	$ 1,460,128	$ 1,201,494
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	743,376	601,549	1,400,656	1,125,860
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue		6,942	5,836	12,572	15,241
Professional services
Disaggregation Of Revenue [Line Items]
Professional services		$ 23,985	$ 28,981	$ 46,900	$ 60,393

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