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Derivatives and Hedging (Tables)
3 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Derivatives And Hedging Disclosure [Abstract]  
Derivative Instruments not Designated as Hedging Instruments 
The following table presents the fair values as of September 30, 2011, and March 31, 2011, of derivative instruments not designated as hedging instruments, classified as Other assets and Other liabilities in the Consolidated Balance Sheets:
 
September 30, 2011
March 31, 2011
 
Assets
Liabilities
Assets
Liabilities
Currency forward contracts
$
8,417

$
1,056

$
1,112

$
1,633

Futures contracts
998

25

57

1,487

Total
$
9,415

$
1,081

$
1,169

$
3,120

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
 
 
Three months ended September 30,
 
 
2011
2010
 
Income Statement Classification
Gains
Losses
Gains
Losses
Currency forward contracts for:
 
 
 
 
 
Operating activities
Other expense
$
5,047

$
(2,835
)
$
982

$
(3,244
)
Seed capital investments
Other non-operating income (expense)
401

(29
)
—

(328
)
Futures contracts
Other non-operating income (expense)
5,964

(566
)
9

(2,394
)
Total
 
$
11,412

$
(3,430
)
$
991

$
(5,966
)
 
 
Six months ended September 30,
 
 
2011
2010
 
Income Statement Classification
Gains
Losses
Gains
Losses
Currency forward contracts for:
 
 
 
 
 
Operating activities
Other expense
$
4,805

$
(3,456
)
$
3,296

$
(3,956
)
Seed capital investments
Other non-operating income (expense)
299

(65
)
6

(108
)
Futures contracts
Other non-operating income (expense)
6,294

(729
)
1,258

(2,020
)
Total
 
$
11,398

$
(4,250
)
$
4,560

$
(6,084
)