Derivatives and Hedging - Schedule of Derivatives Instruments for Gains or Losses Initially Recognized in AOCI in Consolidated Balance Sheet (Detail) - Derivatives Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ (4,916)	$ (8,746)	$ (37,057)	$ (7,277)
Pretax gain/(loss) reclassified from AOCI into income	(1,958)	(1,917)	(10,600)	(1,917)
Interest Rate Swap | Interest (expense) income | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	27	(3,077)	(720)	(3,077)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	(862)	22	$ (2,475)	22
Income Statement Location			Interest (expense) income
Cross Currency Swap | Interest income | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	(907)	(2,355)	$ (8,211)	(2,355)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	147	47	$ 498	47
Income Statement Location			Interest income
Cross Currency Swap | Foreign exchange (loss) | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) reclassified from AOCI into income, cash flow	(1,243)	(1,986)	$ (8,623)	(1,986)
Income Statement Location			Foreign exchange (loss)
Cross Currency Swap | Gain or (loss) on sale of subsidiary | Net Investment
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ (4,036)	$ (3,314)	$ (28,126)	$ (1,845)
Income Statement Location			Gain or (loss) on sale of subsidiary