Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Carrying Amount	$ 345,461	$ 306,667
Accumulated Depreciation	(277,365)	(249,942)
Property and equipment, net	68,096	56,725
Depreciation	22,100	20,400	$ 19,400
Land
Property, Plant and Equipment [Line Items]
Carrying Amount	4	4
Accumulated Depreciation	0	0
Property and equipment, net	4	4
Buildings and improvements
Property, Plant and Equipment [Line Items]
Carrying Amount	146,687	123,434
Accumulated Depreciation	(109,710)	(95,666)
Property and equipment, net	36,977	27,768
Furniture and equipment
Property, Plant and Equipment [Line Items]
Carrying Amount	164,818	148,675
Accumulated Depreciation	(133,870)	(120,747)
Property and equipment, net	30,948	27,928
Software
Property, Plant and Equipment [Line Items]
Carrying Amount	33,952	33,803
Accumulated Depreciation	(33,785)	(33,529)
Property and equipment, net	167	274
Construction in progress
Property, Plant and Equipment [Line Items]
Carrying Amount	0	751
Accumulated Depreciation	0	0
Property and equipment, net	$ 0	$ 751