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Accounts Receivable - Net (Details) - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Accounts Receivable - Net [Abstract]    
Accounts receivable - trade $ 69,864,000 $ 76,902,000
Allowance for bad debts (4,131,000) (4,140,000)
Customer allowances earned (8,543,000) (7,880,000)
Customer payment discrepancies (807,000) (751,000)
Customer returns RGA issued (15,233,000) (12,710,000)
Customer core returns accruals (31,446,000) (25,404,000)
Less: total accounts receivable offset accounts (60,160,000) (50,885,000)
Total accounts receivable - net $ 9,704,000 $ 26,017,000