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Summary of Significant Accounting Policies - Intangible Assets and Impairment of Long-Lived Assets (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Intangible Assets |  |  |
Impairment of long-lived assets | $ 0 | $ 0 |
Contract intangibles |  |  |
Intangible Assets |  |  |
Impairment of long-lived assets |  |  | $ 1,300,000
Leasehold improvements |  |  |
Intangible Assets |  |  |
Impairment of long-lived assets |  |  | $ 600,000

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