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Intangible Assets | 12 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The Company recorded $8.5 million of customer list assets and $0.4 million of trade name assets related to the acquisition of CDI during the fiscal year ended September 30, 2023. The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions):
| September 30, 2023 |  | September 30, 2022 |
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount |
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |
Trade/domain names | $ | 4.1 |  |  | $ | (2.4) |  |  | $ | 1.7 |  |  | $ | 3.7 |  |  | $ | (1.6) |  |  | $ | 2.1 |  |
Software programs/platforms | 28.5 |  |  | (26.9) |  |  | 1.6 |  |  | 28.3 |  |  | (19.4) |  |  | 8.9 |  |
Client base | 38.3 |  |  | (24.1) |  |  | 14.2 |  |  | 29.5 |  |  | (18.0) |  |  | 11.5 |  |
Total intangible assets subject to amortization | 70.9 |  |  | (53.4) |  |  | 17.5 |  |  | 61.5 |  |  | (39.0) |  |  | 22.5 |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |
Website domains | 1.9 |  |  | — |  |  | 1.9 |  |  | 1.8 |  |  | — |  |  | 1.8 |  |
Business licenses | 3.7 |  |  | — |  |  | 3.7 |  |  | 3.7 |  |  | — |  |  | 3.7 |  |
Total intangible assets not subject to amortization | 5.6 |  |  | — |  |  | 5.6 |  |  | 5.5 |  |  | — |  |  | 5.5 |  |
Total intangible assets | $ | 76.5 |  |  | $ | (53.4) |  |  | $ | 23.1 |  |  | $ | 67.0 |  |  | $ | (39.0) |  |  | $ | 28.0 |  |
Amortization expense related to intangible assets was $14.7 million, $14.4 million, and $15.1 million for the years ended September 30, 2023, 2022, and 2021, respectively. As of September 30, 2023, estimated future amortization expense was as follows:
(in millions) |
Fiscal 2024 | $ | 6.7 |
Fiscal 2025 | 3.6 |
Fiscal 2026 | 2.8 |
Fiscal 2027 | 2.2 |
Fiscal 2028 and thereafter | 2.2 |
| $ | 17.5 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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