CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	COMMON STOCK	SHARES EXCHANGEABLE INTO COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	EMPLOYEE STOCK TRUST	DEFERRED COMPENSATION EMPLOYEE STOCK TRUST	RETAINED EARNINGS	APPROPRIATED RETAINED EARNINGS OF CONSOLIDATED INVESTMENT VEHICLES	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET
Balance at Mar. 31, 2010		$ 16,144	$ 2,760	$ 4,447,612	$ (33,095)	$ 33,095	$ 1,316,981	$ 0	$ 58,227
Increase (Decrease) in Stockholders' Equity
Stock options and other stock-based compensation		9		7,177
Deferred compensation employee stock trust		4		1,151
Deferred compensation, net		146		7,257
Exchangeable shares		110	(2,760)	2,650
Equity Units exchanged		0		0
Shares repurchased and retired	(315,067)	(966)		(314,421)
Shares issued to plans					(1,030)	1,030
Distributions and forfeitures					0	0
Net income attributable to Legg Mason, Inc.	47,931						47,931
Dividends declared							(6,551)
Cumulative effect of change in accounting principle								24,666
Net loss reclassified to appropriated retained earnings								(3,072)
Unrealized holding gains on investment securities, net of tax	62								62
Foreign currency translation adjustment	(9,616)								(9,616)
Balance at Jun. 30, 2010	5,595,501	15,447	0	4,151,426	(34,125)	34,125	1,358,361	21,594	48,673
Balance at Mar. 31, 2011	5,770,384	15,022	0	4,111,095	(34,466)	34,466	1,539,984	10,922	93,361
Increase (Decrease) in Stockholders' Equity
Stock options and other stock-based compensation		2		4,894
Deferred compensation employee stock trust		3		1,060
Deferred compensation, net		116		7,965
Exchangeable shares		0	0	0
Equity Units exchanged		183		102,856
Shares repurchased and retired	(200,119)	(603)		(199,516)
Shares issued to plans					(1,063)	1,063
Distributions and forfeitures					679	(679)
Net income attributable to Legg Mason, Inc.	59,952						59,952
Dividends declared							(12,184)
Cumulative effect of change in accounting principle								0
Net loss reclassified to appropriated retained earnings								(2,145)
Unrealized holding gains on investment securities, net of tax	71								71
Foreign currency translation adjustment	13,360								13,360
Balance at Jun. 30, 2011	$ 5,746,398	$ 14,723	$ 0	$ 4,028,354	$ (34,850)	$ 34,850	$ 1,587,752	$ 8,777	$ 106,792