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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