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Financial Instruments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financial Instruments, Owned, at Fair Value [Abstract]
Carrying Amount	$ 2,628,687	$ 2,629,576
Fair Value	$ 2,898,552	$ 2,778,556

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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