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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Consolidated Statement of Comprehensive Income (Loss) [Abstract] |  |  |
Net income (loss) | $ (7,152) | $ (9,486) | $ 15,510
Foreign currency translation adjustments | (3,100) | 4,822 | (928)
Postretirement benefit adjustment, net of tax | 75 | 192 | (439)
Comprehensive income (loss) | $ (10,177) | $ (4,472) | $ 14,143

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