Leases - Lease Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Leases
Operating Lease Right-of-use assets	$ 83,076	$ 87,167
Operating Lease, Short-term lease liability	15,600	16,800
Operating Lease Long-term lease liability	$ 76,971	$ 80,568
Operating Lease Weighted average remaining lease term	7 years 2 months 12 days	7 years 7 months 6 days
Operating Lease Weighted average discount rate	3.00%	3.00%
Finance Lease, Right-of-use assets	$ 12,766	$ 500
Finance Lease, Short-term lease liability	2,900	200
Finance Lease, Long-term lease liability	$ 10,002	$ 395
Finance Lease, Weighted average remaining lease term	4 years 7 months 6 days	2 years 4 months 24 days
Finance Lease, Weighted average discount rate	1.80%	1.70%