Derivatives and Hedging - Schedule of Fair Values of Qualifying and Non-Qualifying Instruments Used in Hedging Transactions (Detail) - USD ($) $ in Thousands	Nov. 30, 2019	May 31, 2019
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	$ 239	$ 513
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		230
Derivatives Designated as Hedging Instruments | Interest Rate Swap (Fair Value) | Other Assets (Long-Term)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Fair value of derivatives assets	882
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	2,198	2,482
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	82
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	5,136	6,163
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	1,445	4,276
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	$ 114	$ 51