SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - LOAN RECEIVABLE (Details) - USD ($)	9 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable in other current assets	$ 7,600,000	$ 6,200,000
Loans receivable in other noncurrent assets	$ 39,400,000	36,200,000
Threshold period in establishing allowance for doubtful accounts	60 days
Allowance for doubtful accounts	$ 0	$ 0
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