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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 26,225 $ 25,290
Benefits 12,673 13,785
Interest 3,852 3,852
Property Taxes 5,058 5,422
Power and Fuel 1,644 1,545
Litigation Settlements and Expenses 1,900 46,533
Sales and Use Tax 2,167 890
Other 8,430 8,553
Accrued Expenses, Total $ 61,949 $ 105,870