CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (14,257)	$ 2,132,859	$ 110,747
Other comprehensive income (loss), net of tax:
Foreign currency translation reclassification adjustments included in income from discontinued operations		(16,567)
Net investment hedge currency translation adjustment, net of tax effects of $(21,228) and $31,769 for the fiscal years 2023 and 2022, respectively	(61,533)	93,020
Foreign currency translation adjustments	77,246	(169,266)	(2,922)
Changes in unrealized gains (losses) on marketable securities, net of tax effects of $1,992 and $(3,729) for the fiscal years 2023 and 2022, respectively	5,774	(10,908)
Actuarial gains, net of tax effects of $(1), $(121), and $(77) for the fiscal years 2023, 2022, and 2021, respectively	3	454	354
Total other comprehensive income (loss), net of tax	21,490	(103,267)	(2,568)
Comprehensive income	$ 7,233	$ 2,029,592	$ 108,179