CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Net income (loss)	$ 213,810	$ (159,928)	$ (150,996)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(11,993)	(23,973)	13,027
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	5,605	0	0
Pension Adjustments	(3,768)	2,644	1,774
Unrealized gains (losses) on marketable securities	246	(192)	(9)
Total other comprehensive (loss) income, net	(9,910)	(21,521)	14,792
Comprehensive income (loss)	$ 203,900	$ (181,449)	$ (136,204)