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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 13,566 $ 22,850
Benefits 12,412 11,503
Interest 7,971 5,992
Property Taxes 6,286 4,759
Power and Fuel 1,708 1,536
Sales and Use Tax 1,161 2,459
Legal 2,231 944
Acquisition Related Expenses 242 350
Other 7,711 4,986
Accrued expenses, total $ 53,288 $ 55,379