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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE FOR SALE SECURITIES (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Accounting Policies [Abstract]    
Available-for-sale securities, fair value disclosure $ 10.9us-gaap_AvailableForSaleSecurities [1] $ 10.7us-gaap_AvailableForSaleSecurities
Available-for-sale securities, gross unrealized gain (loss) 8.3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax 8.1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Accumulated other comprehensive income, available-for-sale securities adjustment, net of tax $ 4.9us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 4.8us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
[1] Included in other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets