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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ 476,923 $ 130,695 $ (27,460)
Other comprehensive income, net of tax:      
Hedge gain (loss) arising during the period, net of tax of $0.4 million, $1.7 million, and $1.7 million in 2021, 2020, and 2019, respectively 1,248 (13,242) 5,251
Net hedge (loss) reclassified into earnings, net of tax of $0 million, $0 million, and $0.1 million in 2021, 2020, and 2019, respectively 0 0 (549)
Realized and unrealized gain (loss) on hedging instruments 1,248 (13,242) 4,702
Foreign currency translation adjustment, net of tax of $0 for each period 1,613 22,076 (24,755)
Unrealized gain (loss) on marketable securities, net of tax of $0 for each period (307) 188 530
Amortization of net actuarial pension gain included in net income, net of tax of $1.2 million, $0.9 million, and $0.7 million in 2021, 2020, and 2019, respectively 2,930 2,983 1,691
Pension net gain (loss) arising during the period net of tax of $0.7 million, $0.7 million, and $3.6 million in 2021, 2020, and 2019, respectively 1,891 (2,791) (8,743)
Change in unamortized pension gain (loss) during the period related to changes in foreign currency 135 (1,878) 1,450
Other comprehensive income (loss) 7,510 7,336 (25,125)
Comprehensive income (loss) $ 484,433 $ 138,031 $ (52,585)