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Contract Liabilities (Details) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Short-term contract liabilities [Abstract]    
Customer allowances earned $ 10,331,000 $ 11,370,000
Customer core returns accruals 4,046,000 4,697,000
Customer deposits 2,720,000 0
Accrued core payment, net 12,142,000 16,536,000
Total short-term contract liabilities 29,239,000 32,603,000
Long-term contract liabilities [Abstract]    
Customer core returns accruals 25,624,000 29,710,000
Accrued core payment, net 16,903,000 18,473,000
Total long-term contract liabilities 42,527,000 48,183,000
Total contract liabilities $ 71,766,000 $ 80,786,000