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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
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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