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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, LOAN RECEIVABLE (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable in other current assets $ 7,800,000 $ 6,200,000
Loans receivable in other noncurrent assets $ 39,500,000 36,200,000
Establishment of allowance for doubtful accounts, customer account balances, days outstanding (more than) 60 days  
Allowance for doubtful accounts $ 0 $ 0
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable term 2 years  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable term 10 years