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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENT - Equity Securities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) item | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($)
Available-for-sale securities |  |  |
Number of securities in an unrealized loss position under 30 days | item | 1 |  |
Other-than-temporary impairment charge | $ 26,000 |  |
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 | 13,400 |  | $ 12,900
Equity securities |  |  |
Available-for-sale securities |  |  |
Cost | 38,473 |  | 64,462
Gross Unrealized Gains | 33,051 |  | 28,530
Gross Unrealized Losses |  |  | 1,509
Equity available-for-sale securities sold, fair value |  | $ 49,200 |
Total gross realized gain on such sales of available-for-sale securities |  | $ 45,200 |
Equity securities | Total Measure at Fair Value |  |  |
Available-for-sale securities |  |  |
Estimated Fair Value | $ 71,524 |  | $ 91,483

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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