Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized losses to marketable securities	$ 400
Marketable Securities	31,901	$ 37,774
Equity investments without readily determinable fair values	3,100	2,600
Estimated Fair Value | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of notes	$ 155,300	$ 469,000