Cash and Cash Equivalents - Components of Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 81,453	$ 49,771
Institutional Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,027	1,020
Cash on hand, unrestricted [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 80,426	$ 48,751