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Income Taxes (Detail) - A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
Balance, beginning of year $ 209 $ 202
Accrued penalties and interest 11 7
Balance, end of period $ 220 $ 209