Contract Liabilities (Details) - USD ($)	Dec. 31, 2020	Mar. 31, 2020
Short-term contract liabilities [Abstract]
Customer core returns accruals	$ 18,212,000	$ 4,126,000
Customer allowances earned	15,207,000	13,844,000
Customer deposits	2,552,000	1,365,000
Core bank liability	1,072,000	528,000
Accrued core payment, net	7,735,000	8,048,000
Total short-term contract liabilities	44,778,000	27,911,000
Long-term contract liabilities [Abstract]
Customer core returns accruals	84,952,000	77,927,000
Customer allowances earned	381,000	542,000
Core bank liability	17,303,000	7,556,000
Accrued core payment, net	1,947,000	6,076,000
Total long-term contract liabilities	$ 104,583,000	$ 92,101,000