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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
Feb. 28, 2019
May 31, 2018
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   $ 133
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 $ 2,099 2,580
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 3,771 1,986
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 3,201 5,293
Derivatives Designated as Hedging Instruments | Interest Rate Swap (Fair Value) | Other Accrued Liabilities    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Fair value of derivatives liabilities 459 441
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 1,377 2,634
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 $ 87 7
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   $ 2,985