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Stock-based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2025	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)				249
Unrecognized compensation cost, options		$ 100		$ 100
Stock based compensation expense		20,328	$ 13,824	32,319	$ 24,844
2018 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	3,700
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, stock options		85,300		$ 85,300
Recognize cost weighted average period				3 years
Grant date fair value				$ 53,000
Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, stock options		58,300		$ 58,300
Recognize cost weighted average period				1 year 10 months 24 days
Grant date fair value				$ 64,700
Performance Stock Unit | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of PSUs that may vest based on performance				0.00%
Performance Stock Unit | Minimum | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				10 months
Performance Stock Unit | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of PSUs that may vest based on performance				140.00%
Performance Stock Unit | Maximum | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				34 months
Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognize cost weighted average period				6 months
Shares subject to options (including performance options) to purchase common stock | 2024 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 600	$ 500	$ 1,100	$ 800

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