Debt - Foreign Subsidiary Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Line of Credit Facility [Line Items]
Less – current maturities	$ (7,144)	$ (5,786)
Total long-term debt	4,606	2,052
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Total debt	5,759	6,592
Less – current maturities	(3,544)	(5,501)
Total long-term debt	2,215	1,091
Receivables pledged as collateral	1,859	672
Foreign subsidiary borrowings | Term loan
Line of Credit Facility [Line Items]
Total debt	2,670	2,318
Foreign subsidiary borrowings | Short-term borrowings
Line of Credit Facility [Line Items]
Total debt	2,620	3,744
Foreign subsidiary borrowings | Factor
Line of Credit Facility [Line Items]
Total debt	$ 469	$ 530