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INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Investments, Debt and Equity Securities [Abstract] |  |
Trading securities cost (in excess of) or below market value | $ 785 | $ 414
Maximum ownership interests in various entities recorded under the cost method | 20.00% |

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- Definition The maximum ownership interests in various entities, which are recorded under the cost method of accounting and are included in equity investments. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=50485924&loc=SL6090603-123010 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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