VARIABLE INTEREST ENTITIES FINANCING RECEIVABLES (Allowance for Loan Losses and Recorded Investments in Loans) (Details) RSO (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2012 RSO [Member]	Dec. 31, 2011 RSO [Member]	Dec. 31, 2012 RSO [Member] Commercial Portfolio Segment [Member]	Dec. 31, 2011 RSO [Member] Commercial Portfolio Segment [Member]	Dec. 31, 2012 RSO [Member] Bank Loans [Member]	Dec. 31, 2011 RSO [Member] Bank Loans [Member]	Dec. 31, 2012 RSO [Member] Lease Receivables [Member]	Dec. 31, 2011 RSO [Member] Lease Receivables [Member]	Dec. 31, 2012 RSO [Member] Loans Receivable - Related Party [Member]	Dec. 31, 2011 RSO [Member] Loans Receivable - Related Party [Member]
Activity in the allowance for credit losses of financing receivables [Roll Forward]
Allowance for losses at beginning of period	$ 10,935	$ 2,024	$ 4,795	$ 27,518	$ 34,303	$ 24,221	$ 31,617	$ 3,297	$ 2,616	$ 0	$ 70	$ 0	$ 0
Provision for loan loss				16,818	13,896	5,225	6,478	11,593	7,418	0	0	0	0
Charge-offs	(124)	(2,099)	(8,067)	(26,645)	(20,681)	(21,460)	(13,874)	(5,185)	(6,737)	0	(70)	0	0
Allowance for losses at end of period	27,613	10,935	2,024	17,691	27,518	7,986	24,221	9,705	3,297	0	0	0	0
Allowance for losses, ending balance:
Individually evaluated for impairment	27,613	10,505		5,378	18,658	2,142	17,065	3,236	1,593	0	0	0	0
Collectively evaluated for impairment	0	430		12,313	8,860	5,844	7,156	6,469	1,704	0	0	0	0
Loans acquired with deteriorated credit quality				0	0	0	0	0	0	0	0	0	0
Loans, ending balance:
Individually evaluated for impairment	62,043	62,622		190,067	125,228	177,055	113,038	4,688	2,693	0	0	8,324	9,497
Collectively evaluated for impairment	0	192,442		1,677,871	1,687,004	489,996	515,944	1,187,875	1,171,060	0	0	0	0
Loans acquired with deteriorated credit quality				$ 751	$ 0	$ 0	$ 0	$ 751	$ 0	$ 0	$ 0	$ 0	$ 0