Consolidated Statements of Stockholder's Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2023	$ 2,677,290	$ 1,188	$ 1,820,905	$ 973,277	$ (118,080)
Beginning balance (in shares) at Sep. 30, 2023		118,846,000
Common stock issued for employee stock-based awards	0	$ 10	(10)
Common stock issued for employee stock-based awards (in shares)		950,000
Shares surrendered by employees to pay taxes related to stock-based awards	(54,336)	$ (4)	(54,332)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(351,000)
Compensation expense from stock-based awards	94,371		94,371
Net Income (Loss)	66,387			66,387
Gain/Loss on net investment hedges, net of tax	(11,511)				(11,511)
Foreign currency translation adjustment	34,674				34,674
Change in defined benefit pension items, net of tax	(222)				(222)
Ending balance at Dec. 31, 2023	2,806,653	$ 1,194	1,860,934	1,039,664	(95,139)
Ending balance (in shares) at Dec. 31, 2023		119,445,000
Beginning balance at Sep. 30, 2024	$ 3,214,398	$ 1,202	1,965,307	1,349,610	(101,721)
Beginning balance (in shares) at Sep. 30, 2024	120,155,000	120,155,000
Common stock issued for employee stock-based awards	$ 0	$ 7	(7)
Common stock issued for employee stock-based awards (in shares)		695,000
Shares surrendered by employees to pay taxes related to stock-based awards	(47,193)	$ (3)	(47,190)
Shares surrendered by employees to pay taxes related to stock-based awards (in shares)		(248,000)
Compensation expense from stock-based awards	93,297		93,297
Repurchases of common stock	(75,000)	$ (4)	(74,996)
Repurchases of common stock (in shares)		(383,000)
Net Income (Loss)	82,232			82,232
Gain/Loss on net investment hedges, net of tax	25,240				25,240
Foreign currency translation adjustment	(63,997)				(63,997)
Change in defined benefit pension items, net of tax	844				844
Ending balance at Dec. 31, 2024	$ 3,229,821	$ 1,202	$ 1,936,411	$ 1,431,842	$ (139,634)
Ending balance (in shares) at Dec. 31, 2024	120,219,000	120,219,000