Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Assets:
Cash and cash equivalents	$ 183,355	$ 101,954
Short-term investments	26,414	14,554
Other assets	8,699	7,730
Liabilities:
Deferred compensation	9,439	7,714
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	183,355	101,954
Short-term investments	26,414	14,554
Other assets	0	0
Liabilities:
Deferred compensation	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	8,699	7,730
Liabilities:
Deferred compensation	9,439	7,714
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	0	0
Liabilities:
Deferred compensation	$ 0	$ 0