CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands	3 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Net Income	$ 61,698	$ 45,043
Other comprehensive income:
Foreign currency translation adjustment	13,360	(9,616)
Unrealized gains (losses) on investment securities:
Unrealized holding gains, net of tax provision of $44 and $42, respectively	67	65
Reclassification adjustment for losses (gains) included in net income	4	(3)
Net unrealized gains on investment securities	71	62
Total other comprehensive income (loss)	13,431	(9,554)
COMPREHENSIVE INCOME	75,129	35,489
Less: Comprehensive income (loss) attributable to noncontrolling interests	1,746	(2,888)
COMPREHENSIVE INCOME ATTRIBUTABLE TO LEGG MASON, INC.	$ 73,383	$ 38,377

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