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Accumulated Other Comprehensive Loss - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 33,802 | $ 21,001
Ending Balance | 30,428 | 33,802
Accumulated other comprehensive loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (10,825) | (10,163)
Change in period | (1,828) | (657)
Tax effect of change in period | 60 | (5)
Ending Balance | (12,593) | (10,825)
Effect of Foreign Currency Translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (4,346) | (3,214)
Change in period | (765) | (1,132)
Ending Balance | (5,111) | (4,346)
Minimum Pension Liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (6,479) | (6,949)
Change in period | (1,063) | 475
Tax effect of change in period | 60 | (5)
Ending Balance | $ (7,482) | $ (6,479)

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