CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (57,559)	$ 14,895
Other comprehensive (loss) income:
Foreign currency translation adjustment	(2,653)	15,814
Pension adjustments	35	14
Unrealized loss on marketable securities	(7)	(29)
Total other comprehensive (loss) income, net	(2,625)	15,799
Comprehensive (loss) income	$ (60,184)	$ 30,694