Stock-Based Compensation - Schedule of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 19,590	$ 14,175
Research and development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	6,376	6,846
General and administrative expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 13,214	$ 7,329