Significant Accounting Policies (Details 1) (Consolidated Legg Mason, Inc., USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Legg Mason, Inc.
Net income (loss) attributable to noncontrolling interests
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ 17	$ 479	$ 898	$ (182)
Net income (loss) reclassified to appropriated retained earnings for consolidated investment vehicle	1,393	(181)	1,792	(3,046)
Total	$ 1,410	$ 298	$ 2,690	$ (3,228)