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Lines of Credit (Detail)
$ in Millions
 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 1.0  
Interest rate terms London Inter-Bank Offer Rate ("LIBOR") plus 2.5%, with a floor of 4%  
Debt Instrument, Description of Variable Rate Basis Prime plus 5%  
liquidity ratio 1.2  
Minimum Net Worth Required for Compliance $ 2.5  
Ratio of Indebtedness to Net Capital 5.0  
Short-term Debt $ 3.2 $ 3.1
Line of Credit    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Description 0.04 0.04
Line of Credit | Prime Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.50% 2.50%