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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENT (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) Partnership | Sep. 30, 2015 USD ($)
Limited Liability Partnerships |  |  |
Number of limited partnerships that entity sold shares of the partnership | Partnership |  | 3 |
Investments in limited partnerships, at carried cost |  | $ 9,400 |
Realized gain on sale of investment securities |  | 8,800 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Non-qualified Supplemental Savings Plan |  |  |
Assets held in Non-qualified Supplement Savings Plan, at fair value | $ 14,300 |  | $ 12,900
Equity securities |  |  |
Available-for-sale securities |  |  |
Cost | 64,462 |  | 64,462
Gross Unrealized Gains | 157,838 |  | 28,530
Gross Unrealized Losses |  |  | 1,509
Equity available-for-sale securities sold, fair value | 49,200 | 214,100 |
Total gross realized gain on such sales of available-for-sale securities | 45,200 | $ 153,400 |
Equity securities | Total Measure at Fair Value |  |  |
Available-for-sale securities |  |  |
Estimated Fair Value | $ 222,300 |  | $ 91,483

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