BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Long-Term Receivables (Details) (USD $)	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	$ 61,312,000	[1]
Additions: Issuance of affiliate advances and other loans, including interest receivable	8,937,000
Deductions: Payments received	(1,041,000)
Balance, end of period	69,208,000	[1]
Notes receivable
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Interest receivable	35,700,000		29,100,000
Affiliates
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	57,782,000	[1]
Additions: Issuance of affiliate advances and other loans, including interest receivable	8,814,000
Deductions: Payments received	0
Balance, end of period	66,596,000	[1]
Others
Notes, Loans and Financing Receivable, Gross, Noncurrent [Roll Forward]
Balance, beginning of period	3,530,000	[1]
Additions: Issuance of affiliate advances and other loans, including interest receivable	123,000
Deductions: Payments received	(1,041,000)
Balance, end of period	$ 2,612,000	[1]

[1] Includes interest receivable of $35.7 million and $29.1 million as of September 30, 2014 and 2013, respectively. The WTG receivables no longer accrue interest pursuant to a release and reimbursement agreement entered into in September 2010.