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Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Non-current investments [Abstract]    
Equity and fixed income mutual funds $ 843 $ 839
Life insurance policies 5,385 5,493
Equity-method investments 0 349
Other (primarily cost-method) investments 16,387 16,395
Total non-current investments $ 22,615 $ 23,076