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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - LOAN RECEIVABLE (Details) (USD $)
 6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable in other current assets $ 5,000,000us-gaap_FinancingReceivableRecordedInvestmentCurrent $ 3,900,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
Loans receivable in other noncurrent assets 32,200,000us-gaap_NotesAndLoansReceivableGrossNoncurrent 27,300,000us-gaap_NotesAndLoansReceivableGrossNoncurrent
Threshold period in establishing allowance for doubtful accounts 60 days  
Allowance for doubtful accounts $ 0us-gaap_AllowanceForDoubtfulAccountsReceivable $ 0us-gaap_AllowanceForDoubtfulAccountsReceivable
Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan term 2 years  
Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan term 10 years