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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Accounts Payable And Accrued Liabilities Current [Abstract]    
Payroll and Incentive Compensation $ 19,155 $ 19,956
Benefits 12,028 10,663
Interest 6,202 3,373
Property Taxes 6,799 4,186
Power and Fuel 1,543 1,390
Sales and Use Tax 857 1,486
Legal 2,357 549
Other 4,852 4,372
Accrued expenses, total $ 53,793 $ 45,975