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Commitments and Contingencies (Operating Leases) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Loss Contingencies [Line Items] |  |  |
Operating leases, rental expense | $ 1.0 | $ 1.2 | $ 1.4
Operating leases, term of contract | 1 year |  |
Future minimum rental commitments | $ 1.7 |  |
Future minimum rental commitments, due in fiscal 2019 | 1.0 |  |
Future minimum rental commitments, due in fiscal 2020 | 0.4 |  |
Future minimum rental commitments, due in fiscal 2021 | 0.2 |  |
Future minimum rental commitments, due in fiscal 2022, less than | 0.1 |  |
Future minimum rental commitments, due in fiscal 2023, less than | 0.1 |  |
Future minimum rental commitments, due in fiscal 2024, less than | 0.1 |  |
Future minimum rental commitments, due thereafter, less than | $ 0.0 |  |
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Severance payment period | 12 months |  |
Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Severance payment period | 36 months |  |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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