Borrowings - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Finance leases	$ 156,329	$ 147,373
Other	26,417	19,898
Debt and capital lease obligations	7,646,352	7,410,907
Less—current portion	(110,602)	(65,047)
Long-Term Borrowings	7,535,750	7,345,860
Receivables Facility, due June 2024
Debt Instrument [Line Items]
Long-term debt	500,000	104,935
Secured Debt \| Senior secured revolving credit facility, due April 2026
Debt Instrument [Line Items]
Long-term debt	505,669	90,897
Secured Debt \| Senior secured term loan facility, due March 2025
Debt Instrument [Line Items]
Long-term debt	0	1,661,611
Secured Debt \| Senior secured term loan facility, due April 2026
Debt Instrument [Line Items]
Long-term debt	281,403	334,135
Secured Debt \| Senior secured term loan facility, due January 2027
Debt Instrument [Line Items]
Long-term debt	835,375	834,619
Secured Debt \| Senior secured term loan facility, due April 2028
Debt Instrument [Line Items]
Long-term debt	724,084	723,170
Secured Debt \| Senior secured term loan facility, due June 2030
Debt Instrument [Line Items]
Long-term debt	$ 1,081,069	0
Senior Notes \| 5.000% senior notes, due April 2025
Debt Instrument [Line Items]
Interest rate stated percentage	5.00%
Long-term debt	$ 548,999	547,981
Senior Notes \| 3.125% senior notes, due April 2025
Debt Instrument [Line Items]
Interest rate stated percentage	3.125%
Long-term debt	$ 353,474	317,204
Senior Notes \| 6.375% senior notes, due May 2025
Debt Instrument [Line Items]
Interest rate stated percentage	6.375%
Long-term debt	$ 1,490,984	1,487,593
Senior Notes \| 5.000% senior notes, due February 2028
Debt Instrument [Line Items]
Interest rate stated percentage	5.00%
Long-term debt	$ 1,142,549	$ 1,141,491

Contractual interest rate for funds borrowed, under the debt agreement.

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