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Intangible Assets | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The Company recorded approximately $420.9 million of client base assets and $6.5 million of trade/domain name and other license assets related to various acquisitions during the fiscal year ended September 30, 2025, further discussed in Note 20. The Company wrote off $16.2 million of fully amortized intangible assets during the fiscal year ended September 30, 2025. The Company recorded $3.6 million of client base assets and wrote off $27.8 million of fully amortized intangible assets during the fiscal year ended September 30, 2024. 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, 2025 |  | September 30, 2024 |
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount |
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |
Trade/domain names and other licenses | $ | 10.6 |  |  | $ | (4.9) |  |  | $ | 5.7 |  |  | $ | 4.1 |  |  | $ | (3.2) |  |  | $ | 0.9 |  |
Software programs/platforms | 2.4 |  |  | (2.0) |  |  | 0.4 |  |  | 4.9 |  |  | (4.1) |  |  | 0.8 |  |
Client base | 445.0 |  |  | (19.2) |  |  | 425.8 |  |  | 37.7 |  |  | (25.6) |  |  | 12.1 |  |
Total intangible assets subject to amortization | 458.0 |  |  | (26.1) |  |  | 431.9 |  |  | 46.7 |  |  | (32.9) |  |  | 13.8 |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |
Website domains | 2.3 |  |  | — |  |  | 2.3 |  |  | 2.1 |  |  | — |  |  | 2.1 |  |
Business licenses | 3.7 |  |  | — |  |  | 3.7 |  |  | 3.7 |  |  | — |  |  | 3.7 |  |
Total intangible assets not subject to amortization | 6.0 |  |  | — |  |  | 6.0 |  |  | 5.8 |  |  | — |  |  | 5.8 |  |
Total intangible assets | $ | 464.0 |  |  | $ | (26.1) |  |  | $ | 437.9 |  |  | $ | 52.5 |  |  | $ | (32.9) |  |  | $ | 19.6 |  |
Amortization expense related to intangible assets was $9.5 million, $7.5 million, and $14.7 million for the years ended September 30, 2025, 2024, and 2023, respectively. As of September 30, 2025, estimated future amortization expense was as follows:
(in millions) |
Fiscal 2026 | $ | 31.9 |
Fiscal 2027 | 28.9 |
Fiscal 2028 | 27.8 |
Fiscal 2029 | 27.0 |
Fiscal 2030 and thereafter | 316.3 |
| $ | 431.9 |

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/985-20/tableOfContent + Details
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