Basis of Presentation and Consolidation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net Assets of Investments [Line Items]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Number of different types of foreign currencies	130
Number of customers company-wide	20,000
Accounts Payable [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		$ 700
Cash and Cash Equivalents [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		17
Deposits and Receivables from Broker-dealers, clearing organizations and counterparties [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		2,600
Investment in managed funds [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		1,300
Noncontrolling Interest [Member]
Net Assets of Investments [Line Items]
Net Assets of Investment in Managed Funds		$ 1,300