Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Net loss	$ (40,456)	$ (136,880)	$ (53,796)	$ (152,604)
Other comprehensive income (loss), net of tax
Net investment hedge currency translation adjustment, net of tax effects of $0 and $0 for the three and six months ended March 31, 2025, respectively, and $(1,739) and $2,837 for the three and six months ended March 31, 2024, respectively	(10,500)	5,080	(5,088)	(8,288)
Foreign currency translation adjustments	23,438	(20,769)	(23,860)	25,725
Changes in unrealized losses on marketable securities, net of tax effects of $0 and $0 for the three and six months ended March 31, 2025, respectively, and $(257) and $607 for the three and six months ended March 31, 2024, respectively	200	752	363	3,276
Actuarial loss on pension plans, net of tax effects of $17 and $34 for the three and six months ended March 31, 2025, respectively, and $(3) and $(1) for the three and six months ended March 31, 2024, respectively	(50)	(7)	(100)	(15)
Total other comprehensive income (loss), net of tax	13,088	(14,944)	(28,685)	20,698
Comprehensive loss	$ (27,368)	$ (151,824)	$ (82,481)	$ (131,906)