Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred tax assets	$ 57,121	$ 40,013
Deferred tax liabilities	(116,095)	(98,548)
Valuation allowance	(8,348)	(5,927)
Net deferred tax liability	$ (67,322)	$ (64,462)