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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive loss | $ 46,362 | $ 50,131
Foreign currency translation adjustment |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive loss | (4,825) | (4,607)
Retirement plan liability adjustment, net of tax |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive loss | (4,164) | (4,648)
Interest rate swap agreement adjustment, net of tax |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive loss | 24 | 4
Total accumulated other comprehensive loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive loss | $ (8,965) | $ (9,251)

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