Debt - Foreign Subsidiary Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Line of Credit Facility [Line Items]
Less – current maturities	$ (5,786)	$ (5,944)
Total long-term debt	2,052	2,332
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Total debt	6,592	7,949
Less – current maturities	(5,501)	(5,822)
Total long-term debt	1,091	2,127
Receivables pledged as collateral	672	2,007
Foreign subsidiary borrowings | Term Loan
Line of Credit Facility [Line Items]
Total debt	2,318	3,548
Foreign subsidiary borrowings | Short Term Borrowings
Line of Credit Facility [Line Items]
Total debt	3,744	3,472
Foreign subsidiary borrowings | Factor
Line of Credit Facility [Line Items]
Total debt	$ 530	$ 929