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Debt - Long-term debt (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Debt
Total debt	$ 2,541,500	$ 2,217,300
Less: Current portion of debt and short-term borrowings	(66,200)	(89,500)
Less: Unamortized debt issuance costs	(23,800)	(14,400)
Long-term debt	2,451,544	2,113,369
Credit Agreement
Debt
Total debt	1,448,300	1,119,800
2027 Senior Notes
Debt
Total debt	997,300	997,300
Other Debt
Debt
Total debt	$ 95,900	$ 100,200

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