Financial Instruments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract]
Carrying Amount	$ 2,632,409	$ 2,628,687
Fair Value	$ 2,453,209	$ 2,898,552

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant