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INVESTMENTS - Non-Current Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Non-current investments [Abstract] |  |
Equity and fixed income mutual funds | $ 24,610 | $ 22,986
Life insurance policies | 4,621 | 4,030
Equity-method investments | 446 | 39,761
Other investments | 33,573 | 18,724
Total non-current investments | $ 63,250 | $ 85,501

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