CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (11,235)	$ 43,320
Other comprehensive income / (loss), net of tax:
Net investment hedge currency translation adjustment, net of tax effects of $19,708 and $0 for the three months ended December 31, 2022 and 2021	(57,127)
Foreign currency translation adjustments	77,414	4,801
Changes in unrealized losses on marketable securities, net of tax effects of $537 and $0 for the three months ended December 31, 2022 and 2021	1,555
Actuarial gains (losses), net of tax effects of $0 and $0 for the three months ended December 31, 2022 and 2021		(3)
Total other comprehensive (loss) income, net of tax	21,842	4,798
Comprehensive income (loss)	$ 10,607	$ 48,118