Debt - Foreign Subsidiary Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Line of Credit Facility [Line Items]
Total debt	$ 3,548
Less – current maturities	(5,944)	$ (7,560)
Total long-term debt	2,332	5,151
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Total debt	7,949	8,346
Less – current maturities	(5,822)	(5,805)
Total long-term debt	2,127	2,541
Receivables pledged as collateral	2,007	3,548
Foreign subsidiary borrowings | Term loan
Line of Credit Facility [Line Items]
Total debt	3,548	3,881
Foreign subsidiary borrowings | Short Term Borrowings
Line of Credit Facility [Line Items]
Total debt	3,472	2,618
Foreign subsidiary borrowings | Factor
Line of Credit Facility [Line Items]
Total debt	$ 929	$ 1,847