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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 33,101 $ 24,904
Benefits 16,151 12,447
Interest 7,841 4,080
Property Taxes 4,675 5,110
Power and Fuel 1,959 1,353
Freight 2,167 529
Legal and Professional 11,828 16,096
Sales and Use Tax 1,067 1,085
Other 6,125 4,838
Accrued Expenses, Total $ 84,914 $ 70,442