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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$ 22,850	$ 19,956
Benefits	11,503	10,663
Interest	5,992	3,373
Property Taxes	4,759	4,186
Power and Fuel	1,536	1,390
Legal	2,459	1,486
Sales and Use Tax	944	549
Acquisition Related Expenses	350
Other	4,986	4,372
Accrued expenses, total	$ 55,379	$ 45,975

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