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Income Taxes - Schedule of Income Taxes from Continuing Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current provision:      
Federal $ 6,550 $ 6,065 $ 6,470
State and foreign 152 136 147
Total current provision 6,702 6,201 6,617
Deferred provision (benefit):      
Federal 169 58 (347)
State and foreign 92 35 (5)
Total deferred provision (benefit) 261 93 (352)
Income tax provision $ 6,963 $ 6,294 $ 6,265