Consolidated Statements of Comprehensive Income (Loss) (Consolidated Legg Mason, Inc., USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Consolidated Legg Mason, Inc.
Net Income (Loss)	$ (12,984)	$ 61,698
Other comprehensive income (loss):
Foreign currency translation adjustment	(13,135)	13,360
Unrealized gains (losses) on investment securities:
Unrealized holding gains, net of tax provision of $41, and $44, respectively	62	67
Reclassification adjustment for (gains) losses included in net income (loss)	(9)	4
Net unrealized gains (losses) on investment securities	53	71
Total other comprehensive income (loss)	(13,082)	13,431
Comprehensive Income (Loss)	(26,066)	75,129
Less: Comprehensive income (loss) attributable to noncontrolling interests	(3,526)	1,746
Comprehensive Income (Loss) Attributable to Legg Mason, Inc.	$ (22,540)	$ 73,383