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Fair Value Measurements (Tables)
 6 Months Ended
Sep. 30, 2012
Fair Value Measurements [Abstract]  
The assets and liabilities that are measured at fair value on a recurring basis
At September 30, 2012, the assets and liabilities that are measured at fair value on a recurring basis were classified as follows:
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
Trading securities (short-term investments)
 
$
2,072
 
 
$
-
 
 
$
-
 
 
$
2,072
 
Derivative financial instruments
 
 
-
 
 
 
205
 
 
 
-
 
 
 
205
 
Total assets
 
$
2,072
 
 
$
205
 
 
$
-
 
 
$
2,277
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$
-
 
 
$
1,593
 
 
$
-
 
 
$
1,593
 
Deferred compensation obligation
 
 
2,072
 
 
 
-
 
 
 
-
 
 
 
2,072
 
Total liabilities
 
$
2,072
 
 
$
1,593
 
 
$
-
 
 
$
3,665
 

At March 31, 2012, the assets and liabilities that are measured at fair value on a recurring basis were classified as follows:
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
Trading securities (short-term investments)
 
$
1,784
 
 
$
12
 
 
$
-
 
 
$
1,796
 
Derivative financial instruments
 
 
-
 
 
 
361
 
 
 
-
 
 
 
361
 
Total assets
 
$
1,784
 
 
$
373
 
 
$
-
 
 
$
2,157
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$
-
 
 
$
3,530
 
 
$
-
 
 
$
3,530
 
Deferred compensation obligation
 
 
1,823
 
 
 
12
 
 
 
-
 
 
 
1,835
 
Total liabilities
 
$
1,823
 
 
$
3,542
 
 
$
-
 
 
$
5,365