Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease, right-of-use asset	$ 155,662	$ 163,940
Operating lease, liability	$ 188,141	$ 199,889
Weighted-average remaining lease term	6 years 10 months 24 days	7 years 1 month 6 days
Weighted-average discount rate	4.55%	4.50%