Business Information - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 54,519	$ 58,487
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	47,261	51,801
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 7,258	$ 6,686