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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) | $ (27,460) | $ 51,987 | $ 6,239
Other comprehensive income (loss), net of tax: |  |  |
Hedge gain (loss) arising during the period, net of tax of $1.7 million, $0.2 million and $0.1 million in 2019, 2018 and 2017, respectively. | 5,251 | 1,445 | (758)
Net hedge gain (loss) reclassified into earnings, net of tax of $0.1 million in 2019, 2018 and 2017, respectively. | (549) | 483 | 459
Realized and unrealized gain (loss) on hedging instruments | 4,702 | 1,928 | (299)
Foreign currency translation adjustment, net of tax of $0 for all periods | (24,755) | (11,767) | 16,593
Unrealized gain (loss) on marketable securities, net of tax of $0 for all periods | 530 | (269) | (22)
Amortization of net actuarial pension loss included in net income, net of tax of $0.7 million in in 2019, 2018, respectively, and $1.0 million and 2017 | 1,691 | 1,629 | 2,392
Pension net gain (loss) arising during the period net of tax of $3.6 million, $1.5 million, and $3.6 million in 2019, 2018, and 2017, respectively | (8,743) | (3,787) | 8,636
Change in unamortized pension loss during the period related to changes in foreign currency | 1,450 | 588 | (1,254)
Other comprehensive income (loss) | (25,125) | (11,678) | 26,046
Comprehensive income (loss) | $ (52,585) | $ 40,309 | $ 32,285

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