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Commitments and Contingencies (Detail) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]    
Operating Leases, Rent Expense (in Dollars) $ 0.8 $ 0.7
Operating lease term 3 years  
Capital lease, current $ 0.3  
Capital lease, noncurrent $ 0.5  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 201