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Other Accrued Liabilities - Summary of Other Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
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