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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$ 17,029	$ 19,082
Benefits	10,560	9,951
Interest	4,524	4,524
Property Taxes	5,667	3,189
Power and Fuel	1,527	1,619
Sales and Use Tax	780	523
Legal	1,402	1,673
Other	8,577	6,269
Accrued expenses, total	$ 50,066	$ 46,830

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