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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Statutory income tax amount $ 2,917 $ 5,548 $ 4,491
State taxes, net of federal benefits (125) 204 (190)
Utilization of tax credits (1,168) (1,116) (250)
Manufacturing deduction (150) (450) (285)
Discrete tax benefits (954) (1,461) (818)
Foreign operations 218 276 181
Valuation reserve 159 (43) 297
Adjustment of tax contingency reserves 257 202 71
Meals and entertainment 63 55 64
Employee stock purchase plan 79 83 76
Contingent consideration (1,172) (154) 0
Other, net 1 68 47
Income tax provision $ 125 $ 3,212 $ 3,684