Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Line Items]
Balance, October 1, 2025	$ 3,493,316
Divestiture of businesses	(82,204)
Foreign currency translation adjustment	(8,103)
Balance, March 31, 2026	$ 3,403,009