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Debt - Narrative (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 09, 2016 | Nov. 30, 2016 | Jun. 30, 2018 | Sep. 30, 2017 | Aug. 04, 2017 | Aug. 03, 2017 | Nov. 08, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolver |  |  | $ 19,492,000 | $ 18,557,000 |  |  |
Foreign debt borrowings, long-term debt, current portion |  |  | 6,071,000 | 7,560,000 |  |  |
Foreign subsidiary borrowings |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding borrowings |  |  | 7,398,000 | 8,346,000 |  |  |
Foreign debt borrowings, current |  |  | 4,973,000 | 5,805,000 |  |  |
Revolver |  |  | 2,368,000 | 2,618,000 |  |  |
Foreign debt borrowings, long-term debt, current portion |  |  | 1,432,000 | 1,340,000 |  |  |
Foreign debt borrowings, factoring payable, current |  |  | 1,173,000 | 1,847,000 |  |  |
Receivables pledged as collateral, carrying value |  |  | $ 2,641,000 | 3,548,000 |  |  |
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% |  |  |  |
Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 39,871,000 |  |  |  |  |  |
Debt issuance costs incurred |  |  |  | 64,000 |  |  |
Debt issuance costs, net |  | $ 785,000 |  |  |  |  |
Debt issuance costs related to the term loan and revolving credit facility, gross |  |  | $ 868,000 |  |  |  |
Credit Facility | Line of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving line of credit, debt Issuance costs incurred, gross |  |  | 793,000 |  |  |  |
Revolving line of credit, accumulated amortization of debt issuance costs |  |  | 327,000 |  |  |  |
Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on LIBOR | 3.75% |  |  |  |  |  |
Credit Facility | Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Issued amount of debt | $ 4,871,000 |  |  |  |  |  |
Installment payment | $ 81,000 |  |  |  |  |  |
Fixed interest rate after effect of interest rate swap | 5.80% |  |  |  |  |  |
Debt issuance costs incurred |  |  | 75,000 |  |  |  |
Accumulated amortization of debt issuance costs |  |  | $ 29,000 |  |  |  |
Credit Facility | Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on LIBOR |  |  | 4.25% |  |  |  |
Weighted average interest rate, revolving credit facility |  |  | 6.30% |  |  |  |
Credit Facility | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 35,000,000 |  |  |  |  |  |
Credit Facility | Revolving credit agreement | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage | 0.15% |  |  |  |  |  |
Credit Facility | Revolving credit agreement | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |  |  |
Credit Facility | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Weighted average interest rate, revolving credit facility |  |  | 5.70% |  |  |  |
Second Amendment | Line of Credit |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  | $ 30,000,000 | $ 35,000,000 |
Second Amendment | Term Loan |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Reduction of term facility |  |  |  |  | $ 700,000 |  |
2015 Credit Agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred |  | 497,000 |  |  |  |  | $ 724,000
Write off of deferred debt issuance cost due to debt modification |  | $ 241,000 |  | $ 81,000 |  |  |
Credit Agreement Third Amendment |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred |  |  | $ 100,000 |  |  |  |

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