Leases - Other Pertinent Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Operating cash flows used for operating leases	$ 45,463	$ 45,080	$ 42,013
Right-of-use assets obtained in exchange for lease obligations
Finance leases	0	33,833	10,333
Operating leases	$ 29,976	$ 28,310	$ 25,690