Leases Maturities of Operating Lease Liabilities (Details) - USD ($)	Mar. 31, 2020	Sep. 30, 2019
Maturities of Operating Lease Liabilities [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 6,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	10,300,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	7,700,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	6,100,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,300,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,500,000
Lessee, Operating Lease, Liability, Payments, Due	37,900,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	3,700,000
Operating lease liabilities	$ 34,200,000	$ 0