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Derivatives and Hedging (Tables)
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Derivatives And Hedging Disclosure [Abstract]    
Derivative Instruments not Designated as Hedging Instruments  
 
 
September 30, 2012
 
March 31, 2012
 
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Currency forward contracts
 
$
527

 
$
897

 
$
38

 
$
685

Futures contracts
 
412

 
10

 
46

 
201

Total
 
$
939

 
$
907

 
$
84

 
$
886
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance
 
 
 
 
Three months ended September 30,
 
 
 
 
2012
 
2011
 
 
Income Statement Classification
 
Gains
 
Losses
 
Gains
 
Losses
Currency forward contracts for:
 
 
 
 
 
 
 
 
 
 
Operating activities
 
Other expense
 
$
314

 
$
(1,132
)
 
$
5,047

 
$
(2,835
)
Seed capital investments
 
Other non-operating income (expense)
 
8

 
(258
)
 
401

 
(29
)
Futures contracts for seed capital investments
 
Other non-operating income (expense)
 
434

 
(1,352
)
 
5,964

 
(566
)
Total
 
 
 
$
756

 
$
(2,742
)
 
$
11,412

 
$
(3,430
)
 
 
 
 
Six months ended September 30,
 
 
 
 
2012
 
2011
 
 
Income Statement Classification
 
Gains
 
Losses
 
Gains
 
Losses
Currency forward contracts for:
 
 
 
 
 
 
 
 
 
 
Operating activities
 
Other expense
 
$
1,297

 
$
(1,087
)
 
$
4,805

 
$
(3,456
)
Seed capital investments
 
Other non-operating income (expense)
 
143

 
(136
)
 
299

 
(65
)
Futures contracts for seed capital investments
 
Other non-operating income (expense)
 
1,422

 
(1,868
)
 
6,294

 
(729
)
Total
 
 
 
$
2,862

 
$
(3,091
)
 
$
11,398

 
$
(4,250
)