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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 28,022 $ 25,290
Benefits 12,066 13,785
Interest 7,198 3,852
Property Taxes 4,584 5,422
Power and Fuel 2,094 1,545
Litigation Settlements 1,800 45,098
Legal 325 1,435
Sales and Use Tax 765 890
Other 10,067 8,553
Accrued Expenses, Total $ 66,921 $ 105,870