Debt - Additional Information (Details) - USD ($)	Nov. 09, 2016	Jun. 26, 2015	Oct. 31, 2011	Sep. 30, 2016	Jan. 01, 2016	Sep. 30, 2015	Sep. 30, 2011
Line Of Credit Facility [Line Items]
Outstanding borrowings				$ 34,873,000
Current maturities of long-term debt				31,009,000		$ 10,503,000
Foreign subsidiary borrowings
Line Of Credit Facility [Line Items]
Outstanding borrowings				9,540,000		13,197,000
Foreign debt borrowings, current				5,833,000		7,542,000
Foreign debt borrowings, short-term borrowings				3,262,000		3,184,000
Current maturities of long-term debt				2,014,000		2,371,000
Foreign debt borrowings, factoring payable, current				557,000		1,987,000
Receivables pledged as collateral, carrying value				$ 599,000		$ 1,620,000
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Minimum
Line Of Credit Facility [Line Items]
Euribor variable interest rates				1.00%
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Maximum
Line Of Credit Facility [Line Items]
Euribor variable interest rates				4.00%
2015 Credit Agreement
Line Of Credit Facility [Line Items]
Debt issuance costs, gross		$ 724,000
2015 Credit Agreement | Term loan
Line Of Credit Facility [Line Items]
Debt agreement term		5 years
Issued amount of debt		$ 20,000,000
Installment payment		$ 714,000
Installment payment starting date		Sep. 30, 2015
Debt issuance costs, term loan, net				$ 241,000
Accumulated amortization of debt issuance costs, term loan				$ 81,000
2015 Credit Agreement | Term loan | London Interbank Offered Rate (LIBOR)
Line Of Credit Facility [Line Items]
Basis spread on LIBOR		2.75%
Weighted average interest rate				3.80%		3.10%
Fixed interest rate after effect of interest rate swap				3.90%
2015 Credit Agreement | Revolving credit agreement
Line Of Credit Facility [Line Items]
Debt agreement term		5 years
Revolving credit facility, maximum borrowing capacity		$ 25,000,000			$ 20,000,000
Percentage of stock of non-U.S. subsidiaries pledged		65.00%
Accordion feature, amount of increase in borrowing capacity		$ 15,000,000
Debt issuance costs, revolver, net				$ 301,000
Accumulated amortization of debt issuance costs, revolver				$ 101,000
2015 Credit Agreement | Revolving credit agreement | Minimum
Line Of Credit Facility [Line Items]
Commitment fee		0.15%
2015 Credit Agreement | Revolving credit agreement | Maximum
Line Of Credit Facility [Line Items]
Commitment fee		0.35%
2015 Credit Agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR)
Line Of Credit Facility [Line Items]
Basis spread on LIBOR		2.75%
Weighted average interest rate				3.90%		3.20%
2016 Amended and Restated Credit and Security Agreement | Line of Credit | Subsequent Event
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 39,871,000
Percentage of stock of non-U.S. subsidiaries pledged	65.00%
Debt issuance costs, gross	$ 700,000
2016 Amended and Restated Credit and Security Agreement | Revolving credit agreement | Line of Credit | Subsequent Event
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	35,000,000
2016 Amended and Restated Credit and Security Agreement | Secured Debt | Line of Credit
Line Of Credit Facility [Line Items]
Outstanding borrowings				$ 4,061,000
2016 Amended and Restated Credit and Security Agreement | Secured Debt | Line of Credit | Subsequent Event
Line Of Credit Facility [Line Items]
Issued amount of debt	4,871,000
Installment payment	$ 81,000
2011 Credit Agreement Amendment | Line of Credit
Line Of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity			$ 40,000,000				$ 30,000,000
Percentage of stock of non-U.S. subsidiaries pledged			65.00%
Installment payment			$ 500,000
Installment payment starting date			Dec. 01, 2011
2011 Credit Agreement Amendment | Revolving credit agreement | Line of Credit
Line Of Credit Facility [Line Items]
Debt agreement term			5 years
Revolving credit facility, maximum borrowing capacity			$ 30,000,000
2011 Credit Agreement Amendment | Secured Debt | Line of Credit
Line Of Credit Facility [Line Items]
Debt agreement term			5 years
Issued amount of debt			$ 10,000,000