Derivatives and Hedging (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Derivative
Amount net for fair value of derivative assets (liabilities)	$ 3,127	$ 1,158
Futures contract \| Legg Mason, Inc.
Derivative
Cash collateral	$ 12,135	$ 7,131

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

Name:	us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant