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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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