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Derivatives and Hedging - Schedule of Fair Values of Qualifying and Non-Qualifying Instruments Used in Hedging Transactions (Detail) - USD ($)
$ in Thousands
Nov. 30, 2017
May 31, 2017
Derivatives Designated as Hedging Instruments | Foreign Currency Exchange (Cash Flow) | Other Current Assets    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives assets $ 438 $ 15
Derivatives Designated as Hedging Instruments | Foreign Currency Exchange (Cash Flow) | Other Accrued Liabilities    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives liabilities 29  
Derivatives Designated as Hedging Instruments | Cross Currency Swap (Net Investment) | Other Current Assets    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives assets 1,905  
Derivatives Designated as Hedging Instruments | Cross Currency Swap (Net Investment) | Other Assets (Long-Term)    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives assets 1,658  
Derivatives Designated as Hedging Instruments | Cross Currency Swap (Net Investment) | Other Long-Term Liabilities    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives liabilities 6,807  
Derivatives Designated as Hedging Instruments | Interest Rate Swap (Fair Value) | Other Current Assets    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives assets 260  
Derivatives Designated as Hedging Instruments | Interest Rate Swap (Fair Value) | Other Long-Term Liabilities    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives liabilities 994  
Derivatives Not Designated as Hedging Instruments | Foreign Currency Exchange (Cash Flow) | Other Current Assets    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives assets 525 $ 24
Derivatives Not Designated as Hedging Instruments | Foreign Currency Exchange (Cash Flow) | Other Accrued Liabilities    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives liabilities $ 202