Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 733,997	$ 376,333	$ 245,540
Other comprehensive income, net of tax:
Hedge loss arising during the period, net of tax of $5.8 million, $5.3 million, and $2.5 million in 2025, 2024, and 2023, respectively	(17,863)	(16,315)	(7,516)
Foreign currency translation adjustment, net of tax of $0 for each period	37,334	36,465	45,692
Change in pension benefit, net of tax of $(0.8) million, $1.7 million, and $1.3 million in 2025, 2024, and 2023, respectively	1,087	(3,791)	(2,798)
Other comprehensive income	20,558	16,359	35,378
Comprehensive income	$ 754,555	$ 392,692	$ 280,918