CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net income (loss)	$ 21,396	$ 213,810	$ (159,928)
Other comprehensive income (loss):
Foreign currency translation adjustment	2,167	(11,993)	(23,973)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	12,331	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0	5,605	0
Pension Adjustments	423	(3,768)	2,644
Unrealized (loss) gain on marketable securities	(66)	246	(192)
Total other comprehensive income (loss), net	14,855	(9,910)	(21,521)
Comprehensive income (loss)	$ 36,251	$ 203,900	$ (181,449)