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Basis of Presentation and Consolidation and Accounting Standards Adopted (Details) $ / shares in Units, client in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 07, 2023 | Oct. 31, 2022 USD ($) | Jun. 30, 2024 USD ($) country client $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) country client $ / shares | Jun. 30, 2023 USD ($) | Sep. 30, 2023 $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Number of countries in which entity operates (more than) | country |  |  | 180 |  | 180 |  |
Number of commercial and institutional clients (more than) | client |  |  | 54 |  | 54 |  |
Number of retail clients | client |  |  | 400 |  | 400 |  |
Stock split, conversion ratio | 1.5 |  |  |  |  |  |
Common stock - par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Gain on acquisition |  |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 23.5 |
Cotton Distributors Inc. |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Fair value of identifiable net assets acquired |  | $ 66.2 |  |  |  |  |
Purchase price |  | $ 42.7 |  |  |  |  |
Gain on acquisition |  |  |  |  |  | $ 23.5 |
Retail Segment |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Number of countries in which entity operates (more than) | country |  |  | 180 |  | 180 |  |

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