Leases (Leases, Lessee Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Amortization of ROU assets	$ 13,572	$ 13,738
Interest on lease liabilities	1,793	1,981
Operating lease cost	15,357	16,052
Short-term lease cost	2,935	4,970
Variable lease cost	0	0
Sublease income	(58)	(56)
Total lease cost	33,599	36,685	$ 20,088
(Gains)/losses on sale and leaseback transactions, net	0	0
Operating cash flows from finance leases	1,810	1,968
Operating cash flows from operating leases	15,758	16,034
Financing cash flows from finance leases	13,373	13,459
ROU assets obtained in exchange for new finance lease liabilities	14,257	14,934
ROU assets obtained in exchange for new operating lease liabilities	4,839	8,456
ROU asset remeasurement	$ 8,177	$ (960)
Weighted average remaining lease term - finance leases	3 years 7 months 6 days	3 years 10 months 24 days
Weighted average remaining lease term - operating leases	4 years 9 months 18 days	5 years 2 months 12 days
Weighted average discount rate - finance leases	4.30%	4.60%
Weighted average discount rate - operating leases	4.00%	4.20%
Lease, Cost	$ 33,599	$ 36,685	$ 20,088