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Reclassification of Prior Periods (Tables)
12 Months Ended
Mar. 31, 2013
Prior Period Adjustment [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
The effect on cost of sales, gross profit and gross margins was immaterial in all periods. The amounts adjusted in fiscal 2012 and fiscal 2011 are as follows:

 
Year ended March 31, 2012
 
As Reported
 
As Adjusted
Cost of sales
$
590,782

 
$
583,882

Gross profit
792,394

 
799,294

Gross margin
57.3
%
 
57.8
%
 
 
 
 
 
Year ended March 31, 2011
 
As Reported
 
As Adjusted
Cost of sales
$
612,769

 
$
605,954

Gross profit
874,436

 
881,251

Gross margin
58.8
%
 
59.3
%