Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Oct. 01, 2019
Lessee, Lease, Description [Line Items]
Weighted Average Remaining Lease Term	6 years	8 years 9 months 18 days
Weighted Average Discount Rate	3.92%	4.24%
Cash Paid for Operating Liabilities	$ 5.7	$ 6.7
Right of Use Asset in Exchange for New Lease Liability	$ 0.0	$ 0.0
Buildings and Property [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	2 months
Operating Lease Renewal Term	1 year
Buildings and Property [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	17 years
Operating Lease Renewal Term	18 years
Drilling Rigs [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	1 year
Compressor Equipment [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	21 months
Compressor Equipment [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	4 years
Guidance for Leases [Member]
Lessee, Lease, Description [Line Items]
Increase in Assets and Liabilities Upon Adoption of Leasing Standard			$ 19.7