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Summary of Significant Accounting Policies - Intangible Assets and Impairment of Long-Lived Assets (Details) - USD ($)
12 Months Ended
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