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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total debt	$ 2,546,900	$ 2,539,800
Less: Current portion of debt and short-term borrowings	(70,300)	(66,900)
Less: Unamortized debt issuance costs	(20,400)	(22,600)
Long-term debt	2,456,184	2,450,330
Credit Agreement
Debt Instrument [Line Items]
Total debt	1,443,200	1,446,600
2027 Senior Notes
Debt Instrument [Line Items]
Total debt	997,300	997,300
Other debt
Debt Instrument [Line Items]
Total debt	$ 106,400	$ 95,900

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