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	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ (41,813)	$ (8,386)	$ 4,998
Pretax gain/(loss) reclassified from AOCI into income	(12,616)	(1,930)
Interest Rate Swap | Interest (Expense) Income | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	(1,226)	(7,998)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ (3,380)	170
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	$ (9,207)	(2,254)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ 638	554
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	$ (9,874)	(2,654)
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	$ (31,380)	$ 1,866	$ 4,998
Income Statement Location	Gain or (loss) on sale of subsidiary