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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 27,548 $ 26,225
Benefits 13,272 12,673
Interest 6,606 3,852
Property Taxes 4,745 5,058
Power and Fuel 1,635 1,644
Litigation Settlements   1,900
Sales and Use Tax 1,130 2,167
Legal and Professional 5,870  
Other 6,864 8,430
Accrued Expenses, Total $ 67,670 $ 61,949