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Accounts Receivable Discount Programs (Tables)
12 Months Ended
Mar. 31, 2013
Accounts Receivable Discount Programs [Abstract]  
Schedule of accounts receivable discount programs
The Company has established 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.
 
   
Years Ended March 31,
 
 
 
2013
  
2012
 
        
Receivables discounted
 $289,529,000  $280,278,000 
Weighted average days
  319   313 
Weighted average discount rate
  2.7 %  2.9 %
Amount of discount as interest expense
 $6,914,000  $7,072,000