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Debt - Long-Term Debt (Detail) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Debt Instrument [Line Items]    
Total $ 258,395,000 $ 236,827,000
Unamortized debt issuance costs (2,119,000) (2,293,000)
Current maturities (25,939,000) (25,932,000)
Long-term debt obligation 230,337,000 208,602,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving Credit Facility 156,200,000 134,400,000
Equipment Financing [Member]    
Debt Instrument [Line Items]    
Revolving Credit Facility 2,195,000 2,427,000
Senior Notes Payable [Member]    
Debt Instrument [Line Items]    
Senior notes $ 100,000,000 $ 100,000,000