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Credit Arrangements Other Indebtedness (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Subordinated note payable          
Line of Credit Facility [Line Items]          
Foreign currency gain/(loss) $ 0 $ 2 $ 6 $ 4  
Mitsui Sumitomo Bank          
Line of Credit Facility [Line Items]          
Annual interest rate 1.50%   1.50%    
Mitsui Sumitomo Bank | Term Loan          
Line of Credit Facility [Line Items]          
Notes payable outstanding $ 755   $ 755   $ 198
MediaMission Holding B.V. | Subordinated note payable          
Line of Credit Facility [Line Items]          
Notes payable outstanding $ 0   $ 0   $ 93