GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS, Net Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Finite-lived Intangible Assets [Roll Forward]
Net identifiable intangible assets (beginning of the period)	$ 66,772	$ 56,988	$ 69,327	$ 58,775
Additions	87	118	160	233
Amortization expense	(2,363)	(1,919)	(4,771)	(3,821)
Foreign currency translation	(537)		(537)
Impairment losses	0	0	0	0
Other			(220)
Net identifiable intangible assets (end of the period)	63,959	55,187	63,959	55,187
Private client group
Finite-lived Intangible Assets [Roll Forward]
Net identifiable intangible assets (beginning of the period)	17,799	8,472	18,182	8,611
Additions	0	0	0	0
Amortization expense	(384)	(139)	(767)	(278)
Foreign currency translation	0		0
Impairment losses	0	0	0	0
Other			0
Net identifiable intangible assets (end of the period)	17,415	8,333	17,415	8,333
Capital markets
Finite-lived Intangible Assets [Roll Forward]
Net identifiable intangible assets (beginning of the period)	31,211	36,600	32,532	37,975
Additions	0	0	0	0
Amortization expense	(1,319)	(1,375)	(2,640)	(2,750)
Foreign currency translation	0		0
Impairment losses	0	0	0	0
Other			0
Net identifiable intangible assets (end of the period)	29,892	35,225	29,892	35,225
Asset management
Finite-lived Intangible Assets [Roll Forward]
Net identifiable intangible assets (beginning of the period)	16,301	10,663	17,137	10,996
Additions	0	0	0	0
Amortization expense	(565)	(333)	(1,181)	(666)
Foreign currency translation	(537)		(537)
Impairment losses	0	0	0	0
Other			(220)
Net identifiable intangible assets (end of the period)	15,199	10,330	15,199	10,330
RJ Bank
Finite-lived Intangible Assets [Roll Forward]
Net identifiable intangible assets (beginning of the period)	1,461	1,253	1,476	1,193
Additions	87	118	160	233
Amortization expense	(95)	(72)	(183)	(127)
Foreign currency translation	0		0
Impairment losses	0	0	0	0
Other			0
Net identifiable intangible assets (end of the period)	$ 1,453	$ 1,299	$ 1,453	$ 1,299