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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$ 19,850	$ 22,850
Benefits	13,433	11,503
Interest	5,791	5,992
Property Taxes	7,332	4,759
Power and Fuel	1,672	1,536
Sales and Use Tax	1,287	2,459
Legal	1,606	944
Acquisition Related Expenses		350
Other	8,817	4,986
Accrued expenses, total	$ 59,788	$ 55,379

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