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Other Accrued Liabilities - Summary of Other Accrued Liabilities (Detail) - USD ($) $ in Thousands | Aug. 31, 2015 | May. 31, 2015
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Schedule of Accrued Liabilities [Line Items] |  |
Payroll and other compensation expenses | $ 25,650 | $ 35,858
Insurance accruals | 7,462 | 5,712
Property, sales and other non-income related taxes | 2,731 | 2,840
Lease commitments | 1,746 | 1,703
Deferred revenue | 1,902 | 1,116
Contingent consideration | 8,778 | 229
Other | 10,413 | 6,727
Total | $ 58,682 | $ 54,185

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