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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Jul. 31, 2018
Sep. 30, 2017
Sep. 30, 2016
Goodwill And Other Intangible Assets [Line Items]        
Goodwill $ 4,343,000      
Other intangible assets     $ 0 $ 0
Amortization expense 194,000      
Amortization expense for fiscal 2019 1,200,000      
Amortization expense for fiscal 2020 1,200,000      
Amortization expense for fiscal 2021 1,200,000      
Amortization expense for fiscal 2022 1,100,000      
Amortization expense for fiscal 2023 500,000      
Quantum        
Goodwill And Other Intangible Assets [Line Items]        
Goodwill 4,343,000 $ 4,300,000    
Other intangible assets $ 8,200,000 $ 8,200,000