Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current:
Federal	$ 18,753	$ 9,465	$ (479)
State and foreign	7,219	3,143	4,646
Total	25,972	12,608	4,167
Deferred:
Federal	(11,182)	983	3,202
State and foreign	(1,620)	3,962	81
Total	(12,802)	4,945	3,283
Total income tax expense	$ 13,170	$ 17,553	$ 7,450