Debt - Foreign Subsidiary Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Line of Credit Facility [Line Items]
Less – current maturities	$ (9,566)	$ (7,144)
Total long-term debt	2,669	4,606
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Total debt	6,632	5,759
Less – current maturities	(4,551)	(3,544)
Total long-term debt	2,081	2,215
Receivables pledged as collateral	485	1,859
Foreign subsidiary borrowings | Term loan
Line of Credit Facility [Line Items]
Total debt	3,127	2,670
Foreign subsidiary borrowings | Short-term borrowings
Line of Credit Facility [Line Items]
Total debt	1,867	2,620
Foreign subsidiary borrowings | Factor
Line of Credit Facility [Line Items]
Total debt	$ 1,638	$ 469