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Investments - Non-Current Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Non-current investments [Abstract] |  |
Equity and fixed income mutual funds | $ 25,949 | $ 24,610
Life insurance policies | 4,653 | 4,621
Other (primarily cost-method) investments | 19,044 | 34,019
Total non-current investments | $ 49,646 | $ 63,250

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