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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Roll Forward] |  |  |
Goodwill, beginning | $ 353,639 | $ 292,243 |
Goodwill attributable to preliminary purchase price adjustments and acquisition activity | 55,924 | 61,396 |
Goodwill, ending | 409,563 | 353,639 |
Software and Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning | 234,553 | 173,157 |
Goodwill attributable to preliminary purchase price adjustments and acquisition activity | 53,060 | 61,396 |
Goodwill, ending | 287,613 | 234,553 |
Accumulated impairment losses |  |  | $ 11,458
Merchant Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning | 119,086 | 119,086 |
Goodwill attributable to preliminary purchase price adjustments and acquisition activity | 2,864 | 0 |
Goodwill, ending | 121,950 | 119,086 |
Accumulated impairment losses |  |  | 0
Other |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning | 0 | 0 |
Goodwill attributable to preliminary purchase price adjustments and acquisition activity | 0 | 0 |
Goodwill, ending | $ 0 | $ 0 |
Accumulated impairment losses |  |  | $ 0

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