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Derivatives and Hedging (Details 1) (Legg Mason Group, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Mar. 31, 2012
Forward foreign currency contracts
   
Derivative    
Currency forward contracts with aggregate gross asset fair values $ 242 $ 38
Currency forward contracts with aggregate gross liability fair values 635 685
Futures contracts
   
Derivative    
Open futures contracts with aggregate gross asset fair values 75 46
Open futures contracts with aggregate gross liability fair values 109 201
Derivatives - Total
   
Derivative    
Derivative Assets 317 84
Derivative Liabilities $ 744 $ 886