Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized (losses) gains to marketable securities	$ 0	$ 0
Equity investments without readily determinable fair values	2,600,000		$ 2,600,000
Impairment related to investments without readily determinable fair values	0	$ 0
Estimated Fair Value | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of notes	$ 165,600,000		$ 174,200,000