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Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]
Payroll and Incentive Compensation	$ 26,001	$ 22,850
Benefits	14,204	11,503
Interest	7,196	5,992
Property Taxes	3,817	4,759
Power and Fuel	1,800	1,536
Sales and Use Tax	486	2,459
Legal Settlement	39,098
Other Legal	2,770	944
Acquisition Related Expenses		350
Other	6,060	4,986
Accrued expenses, total	$ 101,432	$ 55,379

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