CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Consolidated Legg Mason Group [Member], USD $) In Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Legg Mason Group [Member]
Net Income	$ 57,383	$ 76,588	$ 119,081	$ 121,631
Other comprehensive income:
Foreign currency translation adjustment	(46,026)	29,588	(32,666)	19,972
Unrealized gains (losses) on investment securities:
Unrealized holding gains, net of tax provision of $124, $13, $172 and $56, respectively	186	20	253	85
Reclassification adjustment for losses (gains) included in net income	0	0	4	(3)
Net unrealized gains on investment securities	186	20	257	82
Total other comprehensive income (loss)	(45,840)	29,608	(32,409)	20,054
COMPREHENSIVE INCOME	11,543	106,196	86,672	141,685
Less: Comprehensive income (loss) attributable to noncontrolling interests	719	1,253	2,465	(1,635)
COMPREHENSIVE INCOME ATTRIBUTABLE TO LEGG MASON, INC.	$ 10,824	$ 104,943	$ 84,207	$ 143,320

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