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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
Aug. 31, 2020
May 31, 2020
May 31, 2019
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 $ 5,652 $ 5,352  
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   12,409  
Derivatives Designated as Hedging Instruments | Cross Currency Swap | Net Investment | Other Accrued Liabilities      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Fair value of derivatives liabilities 701 294  
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 29,537 18,204  
Derivatives Designated as Hedging Instruments | Cross Currency Swap | Cash Flow | Other Current Assets      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Fair value of derivatives assets 632 750  
Derivatives Designated as Hedging Instruments | Cross Currency Swap | Cash Flow | Other Long-Term Liabilities      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Fair value of derivatives liabilities 11,320 3,608  
Derivatives Designated as Hedging Instruments | Interest Rate Swap | Cash Flow | Other Accrued Liabilities      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Fair value of derivatives liabilities 3,238 2,981  
Derivatives Designated as Hedging Instruments | Interest Rate Swap | Cash Flow | Other Long-Term Liabilities      
Derivative Instruments And Hedging Activities Disclosures [Line Items]      
Fair value of derivatives liabilities 4,761 $ 5,187  
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 $ 28   $ 53