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Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Non-current investments [Abstract]    
Equity and fixed income mutual funds $ 1,484 $ 699
Life insurance policies 4,835 4,926
Equity-method investments 333 323
Other (primarily cost-method) investments 20,158 19,040
Total non-current investments $ 26,810 $ 24,988