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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 |  |  |  |

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