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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
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Accounts Payable And Accrued Liabilities Current [Abstract] |  |
Payroll and Incentive Compensation | $ 24,917 | $ 19,956
Benefits | 10,686 | 10,663
Interest | 8,132 | 3,373
Property Taxes | 3,729 | 4,186
Power and Fuel | 1,807 | 1,390
Sales and Use Tax | 798 | 1,486
Legal | 2,217 | 549
Other | 5,363 | 4,372
Accrued expenses, total | $ 57,649 | $ 45,975

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