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Accounts Receivable Discount Programs
9 Months Ended
Dec. 31, 2012
Accounts Receivable Discount Programs [Abstract]  
Accounts Receivable Discount Programs
9. Accounts Receivable Discount Programs

Both of the Company's segments use receivable discount programs with certain customers and their respective banks. Under these programs, the Company may sell those customers' receivables to those banks at a discount to be agreed upon at the time the receivables are sold. These discount arrangements allow the Company to accelerate collection of customers' receivables.

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