Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 313,081	$ 476,923	$ 130,695
Other comprehensive income (loss), net of tax:
Hedge gain (loss) arising during the period, net of tax of $5.8 million, $0.4 million, and $1.7 million in 2022, 2021, and 2020, respectively	17,556	1,248	(13,242)
Foreign currency translation adjustment, net of tax of $0 for each period	(92,768)	1,613	22,076
Unrealized gain (loss) on marketable securities, net of tax of $0 for each period	0	(307)	188
Amortization of net actuarial pension gain included in net income, net of tax of $0.4 million, $1.2 million, and $0.9 million in 2022, 2021, and 2020, respectively	1,010	2,930	2,983
Pension net gain (loss) arising during the period net of tax of $6.1 million, $0.7 million, and $0.7 million in 2022, 2021, and 2020, respectively	15,027	1,891	(2,791)
Change in unamortized pension gain (loss) related to changes in foreign currency, net of tax of $0.6 million, $0.0 million, and $0.7 million in 2022, 2021, and 2020, respectively	1,581	135	(1,878)
Other comprehensive income (loss)	(57,594)	7,510	7,336
Comprehensive income	$ 255,487	$ 484,433	$ 138,031