Business Combinations - Segment Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Financial Services
Business Combination Segment Allocation [Line Items]
Goodwill	$ 79,147	$ 58,409
Total	132,547	97,826
Financial Services | Client list
Business Combination Segment Allocation [Line Items]
Intangibles	53,400	38,580
Financial Services | Other intangibles
Business Combination Segment Allocation [Line Items]
Intangibles	0	837
Benefits and Insurance Services
Business Combination Segment Allocation [Line Items]
Goodwill	0	1,798
Total	0	3,134
Benefits and Insurance Services | Client list
Business Combination Segment Allocation [Line Items]
Intangibles	0	1,290
Benefits and Insurance Services | Other intangibles
Business Combination Segment Allocation [Line Items]
Intangibles	$ 0	$ 46