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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Net Investment Hedge [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net liabilities $ 4,228 $ 4,466
Contingent Consideration Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net liabilities 9,520 1,407
Significant Other Observable Inputs (Level 2) [Member] | Net Investment Hedge [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net liabilities 4,228 4,466
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net liabilities $ 9,520 $ 1,407