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
	Aug. 31, 2021	Aug. 31, 2020
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ 13,714	$ (31,087)
Pretax gain/(loss) reclassified from AOCI into income	2,616	(8,030)
Interest Rate Swap | Interest (expense) | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	(36)	(598)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ (929)	(766)
Income Statement Location	Interest (expense)
Cross Currency Swap | Interest income | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ 3,447	(7,356)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ 138	191
Income Statement Location	Interest income
Cross Currency Swap | Foreign exchange gain (loss) | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ 3,407	(7,455)
Income Statement Location	Foreign exchange gain (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	$ 10,303	$ (23,133)
Income Statement Location	Gain or (loss) on sale of subsidiary