XML 1045 R52.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Values of Assets and Liabilities (Details) (Legg Mason, Inc., USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Legg Mason, Inc.
     
Investment securities:      
Current investments $ 412,119 $ 400,510  
Available-for-sale 11,913 11,300  
Other 112 [1] 270 [1]  
Total 424,144 412,080  
Net unrealized and realized gain (loss) for investment securities classified as trading (6,063) 28,355 125,395
Gross unrealized gains for investments classified as available-for-sale 551 157  
Gross unrealized losses for investments classified as available-for-sale (184) (186)  
Available-for-sale:      
Proceeds 6,197 4,012 1,279
Gross realized gains 6 7 1
Gross realized losses $ (25) $ (19) $ (4)
[1] (1)Includes investments in private equity securities that do not have readily determinable fair values.