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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 9,890 | $ (7,152) | $ (9,486)
Foreign currency translation adjustments | (2,743) | (3,100) | 4,822
Postretirement benefit adjustment, net of tax | (25) | 75 | 192
Comprehensive income (loss) | $ 7,122 | $ (10,177) | $ (4,472)

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