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Inventory (Tables)
 6 Months Ended
Sep. 30, 2019
Inventory [Abstract]  
Inventory Net
Inventory–net is comprised of the following:

  
September 30, 2019
  
March 31, 2019
 
Inventory - net
      
Raw materials
 
$
104,180,000
  
$
95,757,000
 
Work-in-process
  
4,720,000
   
3,502,000
 
Finished goods
  
154,901,000
   
146,366,000
 
 
  
263,801,000
   
245,625,000
 
Less allowance for excess and obsolete inventory
  
(13,134,000
)
  
(11,899,000
)
Total inventory - net
 
$
250,667,000
  
$
233,726,000
 
Inventory unreturned
 
$
8,684,000
  
$
8,469,000