CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (99,267)	$ 5,798	$ (80,699)	$ 37,902
Other comprehensive (loss) income:
Foreign currency translation adjustments	(12,013)	3,937	(22,697)	5,786
Pension adjustments, net	122	22	256	96
Net unrealized loss on available-for-sale securities	(81)	(14)	(248)	(14)
Total other comprehensive (loss) income	(11,972)	3,945	(22,689)	5,868
Comprehensive (loss) income	$ (111,239)	$ 9,743	$ (103,388)	$ 43,770