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Debt - Long-term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Debt
Total debt	$ 2,205,900	$ 2,217,300
Less: Current portion of debt and short-term borrowings	(91,500)	(89,500)
Less: Unamortized debt issuance costs	(12,000)	(14,400)
Long-term debt	2,102,358	2,113,369
Credit Agreement
Debt
Total debt	1,105,100	1,119,800
2027 Senior Notes
Debt
Total debt	997,300	997,300
Other Debt
Debt
Total debt	$ 103,500	$ 100,200

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