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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ (54,465) | $ 47,557 | $ 160,194
Other comprehensive income (loss), net of tax: |  |  |
Unrealized hedge gain (loss) arising during the period | (3,375) | 0 | 0
Net hedge loss reclassified into earnings | 2,131 | 0 | 0
Unrealized loss on hedging instruments | (1,244) | 0 | 0
Foreign currency translation adjustment, net of tax of $0 for all periods | 408 | (47,177) | (24,069)
Unrealized loss on marketable securities, net of tax | (122) | 0 | 0
Amortization of net actuarial pension loss included in net income, net of tax of $0.7 million, $18.5 million, and $0.3 million in 2016, 2015 and 2014, respectively | 1,609 | 52,249 | 3,048
Pension net loss arising during the period net of tax of $3.5 million, $1.6 million and $2.8 million in 2016, 2015, and 2014, respectively | (8,646) | (4,797) | (24,267)
Change in unamortized pension loss during the period related to changes in foreign currency | (216) | 2,350 | 2,081
Other comprehensive income (loss) | (8,211) | 2,625 | (43,207)
Comprehensive income (loss) | $ (62,676) | $ 50,182 | $ 116,987

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