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Fair Values of Assets and Liabilities Available-for-sale investments (Tables)
 12 Months Ended
Mar. 31, 2012
Investments and Fair Values of Assets and Liabilities [Abstract]  
Schedule of Realized Gain (Loss)
 
 
Years Ended March 31,
 
 
2012
 
2011
 
2010
Available-for-sale:
 
 
 
 
 
 
Proceeds
 
$
6,197

 
$
4,012

 
$
1,279

Gross realized gains
 
6

 
7

 
1

Gross realized losses
 
(25
)
 
(19
)
 
(4
)