Financial Instruments - Other Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Summary of Investment Holdings [Line Items]
Life Insurance Contracts	$ 42,242	$ 42,171
Total other investments	73,976	95,025
Equity Mutual Fund
Summary of Investment Holdings [Line Items]
Mutual Funds	15,837	19,506
Fixed Income Mutual Fund
Summary of Investment Holdings [Line Items]
Mutual Funds	$ 15,897	$ 33,348