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Accounts Receivable Discount Programs (Tables)
9 Months Ended
Dec. 31, 2012
Accounts Receivable Discount Programs [Abstract]  
Schedule of accounts receivable discount programs
The following is a summary of the Company's accounts receivable discount programs:

   
Nine Months Ended
 
   
December 31,
 
 
 
2012
  
2011
 
        
Receivables discounted
 $229,314,000  $197,019,000 
Weighted average days
  316   314 
Annualized weighted average discount rate
  2.8 %  2.9 %
Amount of discount as interest expense
 $5,525,000  $4,984,000