Debt - Narrative (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2022 USD ($)	Mar. 31, 2022 USD ($) lender	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) customer lender	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 23, 2022 USD ($)	Mar. 22, 2022 USD ($)
Line of Credit Facility [Line Items]
Number of customer invoices factored | customer				1
Gain on extinguishment of debt		$ 5,106,000	$ 0	$ 5,106,000	$ 0
Foreign subsidiary borrowings
Line of Credit Facility [Line Items]
Receivables pledged as collateral		594,000		594,000		$ 485,000
Remaining debt balance		$ 6,809,000		$ 6,809,000		6,632,000
Foreign subsidiary borrowings | Euribor | Minimum
Line of Credit Facility [Line Items]
Euribor variable interest rates		1.00%		1.00%
Foreign subsidiary borrowings | Euribor | Maximum
Line of Credit Facility [Line Items]
Euribor variable interest rates		4.20%		4.20%
First Loan
Line of Credit Facility [Line Items]
Debt instrument, number of lenders | lender		1		1
Face amount		$ 1,141,000		$ 1,141,000
Debt instrument, term				6 years
Quarterly payment				$ 56,000
Revolving credit agreement | Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Receivables pledged as collateral		26,126,000		26,126,000		25,370,000
Revolving credit facility, maximum borrowing capacity		35,000,000		35,000,000		35,000,000
Remaining borrowing capacity		12,759,000		$ 12,759,000		$ 14,570,000
Percent availability under revolving commitment				10.00%		10.00%
Letters of credit outstanding, amount		$ 1,800,000		$ 1,800,000		$ 1,800,000
Line of credit facility, unfunded capital expenditures							$ 1,500,000
Line of credit facility, accordion feature, letter of credit sub limit							$ 3,000,000	$ 2,000,000
Weighted average interest rate, revolving credit facility		2.30%		2.30%		1.80%
Commitment fee percentage				0.25%
Revolving credit agreement | Credit Agreement | Revolving credit agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread on LIBOR						1.75%
Revolving credit agreement | Credit Agreement | Revolving credit agreement | SOFR
Line of Credit Facility [Line Items]
Basis spread on LIBOR				2.00%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement
Line of Credit Facility [Line Items]
Weighted average interest rate, revolving credit facility		1.80%		1.80%		1.30%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement | LIBOR
Line of Credit Facility [Line Items]
Basis spread on LIBOR						1.25%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement | SOFR
Line of Credit Facility [Line Items]
Basis spread on LIBOR				1.50%
Revolving credit agreement | 2018 Credit Agreement | Revolving credit agreement
Line of Credit Facility [Line Items]
Remaining unamortized amount		$ 86,000		$ 86,000
Revolving line of credit, accumulated amortization of debt issuance costs		31,000		31,000		$ 17,000
Unsecured Promissory Note | PPP Loan | JPMorgan Chase Bank, N.A.
Line of Credit Facility [Line Items]
Remaining debt balance		$ 0		0		$ 4,764,000
Debt instrument, decrease, forgiveness	$ 5,025,000
Repayment debt	$ 261,000
Gain on extinguishment of debt				5,106,000
Debt Instrument, decrease, interest forgiven				$ 81,000