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Intangible Assets - (Tables) | 3 Months Ended
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Dec. 31, 2019
Intangible Assets [Abstract] |
Schedule of Finite and Indefinite-Lived Intangible Assets [Table Text Block] | 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):
| December 31, 2019 |  | September 30, 2019
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |
Software programs/platforms | $ | 5.3 |  |  | $ | (3.1 | ) |  | $ | 2.2 |  |  | $ | 5.3 |  |  | $ | (3.0 | ) |  | $ | 2.3 |
Client base | 22.1 |  |  | (13.1 | ) |  | 9.0 |  |  | 22.1 |  |  | (12.5 | ) |  | 9.6 |
Total intangible assets subject to amortization: | 27.4 |  |  | (16.2 | ) |  | 11.2 |  |  | 27.4 |  |  | (15.5 | ) |  | 11.9 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |  |  |  |
Website domains | 2.1 |  |  | — |  |  | 2.1 |  |  | 2.1 |  |  | — |  |  | 2.1 |
Business licenses | 2.7 |  |  | — |  |  | 2.7 |  |  | 2.7 |  |  | — |  |  | 2.7 |
Total intangible assets not subject to amortization: | 4.8 |  |  | — |  |  | 4.8 |  |  | 4.8 |  |  | — |  |  | 4.8 |
Total intangible assets | $ | 32.2 |  |  | $ | (16.2 | ) |  | $ | 16.0 |  |  | $ | 32.2 |  |  | $ | (15.5 | ) |  | $ | 16.7 |
Schedule of Expected Amortization Expense [Table Text Block] | Amortization expense related to intangible assets was $0.7 million and $0.6 million for the three months ended December 31, 2019 and 2018, respectively. As of December 31, 2019, the estimated future amortization expense was as follows:
(in millions) |
Fiscal 2020 (remaining nine months) | $ | 2.2 |
Fiscal 2021 | 2.9 |
Fiscal 2022 | 1.6 |
Fiscal 2023 | 1.4 |
Fiscal 2024 and thereafter | 3.1 |
Total intangible assets subject to amortization | $ | 11.2 |

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- Definition Intangible Assets [Abstract] + References No definition available. + Details
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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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- 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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