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Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite and Indefinite-Lived Intangible Assets | 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, 2021 |  | September 30, 2020 |
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount |
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |
Trade/domain names | $ | 3.7 |  |  | $ | (0.9) |  |  | $ | 2.8 |  |  | $ | 3.7 |  |  | $ | (0.2) |  |  | $ | 3.5 |  |
Software programs/platforms | 31.4 |  |  | (13.3) |  |  | 18.1 |  |  | 29.0 |  |  | (4.9) |  |  | 24.1 |  |
Customer base | 37.7 |  |  | (21.7) |  |  | 16.0 |  |  | 38.2 |  |  | (16.3) |  |  | 21.9 |  |
Total intangible assets subject to amortization | 72.8 |  |  | (35.9) |  |  | 36.9 |  |  | 70.9 |  |  | (21.4) |  |  | 49.5 |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |
Website domains | 2.1 |  |  | — |  |  | 2.1 |  |  | 2.1 |  |  | — |  |  | 2.1 |  |
Business licenses | 3.7 |  |  | — |  |  | 3.7 |  |  | 3.2 |  |  | — |  |  | 3.2 |  |
Total intangible assets not subject to amortization | 5.8 |  |  | — |  |  | 5.8 |  |  | 5.3 |  |  | — |  |  | 5.3 |  |
Total intangible assets | $ | 78.6 |  |  | $ | (35.9) |  |  | $ | 42.7 |  |  | $ | 76.2 |  |  | $ | (21.4) |  |  | $ | 54.8 |  |
Schedule of Expected Amortization Expense | As of September 30, 2021, estimated future amortization expense was as follows:
(in millions) |
Fiscal 2022 | $ | 14.4 |
Fiscal 2023 | 12.7 |
Fiscal 2024 | 5.2 |
Fiscal 2025 | 1.9 |
Fiscal 2026 and thereafter | 2.7 |
| $ | 36.9 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life or exist in perpetuity, by either major class or business segment. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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