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Accounts Receivable - Net (Tables)
 12 Months Ended
Mar. 31, 2018
Accounts Receivable - Net [Abstract]  
Schedule of accounts receivable
Accounts receivable — net is comprised of the following at March 31:

  
2018
  
2017
 
Accounts receivable — trade
 
$
83,700,000
  
$
76,902,000
 
Allowance for bad debts
  
(4,142,000
)
  
(4,140,000
)
Customer allowances earned
  
(11,370,000
)
  
(7,880,000
)
Customer payment discrepancies
  
(1,110,000
)
  
(751,000
)
Customer returns RGA issued
  
(15,274,000
)
  
(12,710,000
)
Customer core returns accruals
  
(36,066,000
)
  
(25,404,000
)
Less: total accounts receivable offset accounts
  
(67,962,000
)
  
(50,885,000
)
Total accounts receivable — net
 
$
15,738,000
  
$
26,017,000
 
Schedule of change in warranty return accrual
The following summarizes the change in the Company’s warranty return accrual:

  
Years Ended March 31,
 
  
2018
  
2017
  
2016
 
Balance at beginning of period
 
$
14,286,000
  
$
10,845,000
  
$
10,904,000
 
Charged to expense
  
105,156,000
   
99,673,000
   
80,099,000
 
Amounts processed
  
(102,796,000
)
  
(96,232,000
)
  
(80,158,000
)
Balance at end of period
 
$
16,646,000
  
$
14,286,000
  
$
10,845,000