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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - Contingent Consideration Liabilities [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,407 $ 2,015
Accretion of liability 43 163
Foreign currency effects   (21)
Payment (230) (1,000)
Revaluation 522  
Acquisitions 7,778 250
Ending balance $ 9,520 $ 1,407