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Contract Liabilities (Details) - USD ($)
Sep. 30, 2019
Mar. 31, 2019
Short-term contract liabilities [Abstract]    
Customer allowances earned $ 10,365,000 $ 12,755,000
Customer core returns accruals 3,973,000 3,933,000
Customer deposits 1,377,000 2,674,000
Accrued core payment, net 8,349,000 11,237,000
Total short-term contract liabilities 24,064,000 30,599,000
Long-term contract liabilities [Abstract]    
Customer core returns accruals 38,841,000 25,722,000
Accrued core payment, net 10,486,000 15,167,000
Total long-term contract liabilities $ 49,327,000 $ 40,889,000