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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | $ 45,239 | $ 46,421 | $ 44,189 | $ 48,595 | $ 49,891 | $ 50,131
Foreign currency translation adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | (5,542) |  | (4,955) |  |  |
Retirement plan liability adjustment, net of tax |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | (3,459) |  | (3,674) |  |  |
Total accumulated other comprehensive loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total accumulated other comprehensive loss | $ (9,001) | $ (8,949) | $ (8,629) | $ (8,078) | $ (8,773) | $ (9,251)

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