Business Combinations - Segment Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Financial Services
Business Combination Segment Allocation [Line Items]
Goodwill	$ 41,322	$ 79,147
Total	74,536	132,547
Financial Services | Client list
Business Combination Segment Allocation [Line Items]
Intangibles	33,196	53,400
Financial Services | Other intangibles
Business Combination Segment Allocation [Line Items]
Intangibles	18	0
Benefits and Insurance Services
Business Combination Segment Allocation [Line Items]
Goodwill	3,932	0
Total	5,985	0
Benefits and Insurance Services | Client list
Business Combination Segment Allocation [Line Items]
Intangibles	2,053	0
Benefits and Insurance Services | Other intangibles
Business Combination Segment Allocation [Line Items]
Intangibles	$ 0	$ 0