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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

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