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Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 41  
Deferred tax asset, income tax expense (benefit) 500  
Deemed repatriation tax 771 $ 0
Income tax expense $ 882 $ 1,162
Effective Income Tax Rate, Continuing Operations (79.70%) 34.10%
Deferred Tax Assets, Valuation Allowance $ 2,658 $ 2,712
Deferred Tax Assets, Other Tax Carryforwards 55  
Undistributed Earnings of Foreign Subsidiaries 12,700 2,800
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 220  
Accrued penalties and interest 11 7
U.S.    
Operating Loss Carryforwards 1,700 0
State    
Valuation Allowance, Deferred Tax Asset, Change in Amount 54  
Operating Loss Carryforwards 500 $ 400
U.K.    
Operating Loss Carryforwards $ 8,800