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Accounts Receivable - Net (Details) - USD ($)
Sep. 30, 2017
Mar. 31, 2017
Accounts Receivable - Net [Abstract]    
Accounts receivable - trade $ 80,510,000 $ 76,902,000
Allowance for bad debts (4,142,000) (4,140,000)
Customer allowances earned (11,558,000) (7,880,000)
Customer payment discrepancies (944,000) (751,000)
Customer returns RGA issued (17,882,000) (12,710,000)
Customer core returns accruals (33,591,000) (25,404,000)
Less: total accounts receivable offset accounts (68,117,000) (50,885,000)
Total accounts receivable - net $ 12,393,000 $ 26,017,000