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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
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Accounts Payable And Accrued Liabilities Current [Abstract] |  |
Payroll and Incentive Compensation | $ 21,199 | $ 25,290
Benefits | 13,076 | 13,785
Interest | 3,852 | 3,852
Property Taxes | 8,292 | 5,422
Power and Fuel | 1,473 | 1,545
Litigation Settlements | 345 | 45,098
Rail Freight | 2,012 |
Legal | 2,185 | 1,435
Sales and Use Tax | 929 | 890
Other | 8,860 | 8,553
Accrued Expenses, Total | $ 62,223 | $ 105,870

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