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Debt and Floor Plan Payable - Summary of Long Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]    
Long term debt $ 59,332 $ 59,331
Long term debt 59,332 59,331
Less current portion 2 404
Total long-term debt 59,330 58,927
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long term debt 46,900  
Long term debt 46,900  
Obligations Under Industrial Revenue Bonds Due 2029 [Member]    
Debt Instrument [Line Items]    
Long term debt 12,430 12,430
Long term debt 12,430 12,430
Capital Lease Obligations and Other Debt [Member]    
Debt Instrument [Line Items]    
Long term debt 2 4
Long term debt $ 2 4
Term Loans Due March 2020 [Member]    
Debt Instrument [Line Items]    
Long term debt   46,897
Long term debt   $ 46,897