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. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ (8,746)	$ (400)	$ (7,277)	$ 3,336
Pretax gain/(loss) reclassified from AOCI into income	(1,917)		(1,917)
Interest Rate Swap | Interest Expense | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	(3,077)		(3,077)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ 22		$ 22
Income Statement Location	Interest Expense		Interest Expense
Cross Currency Swap | Interest Expense | Cash Flow
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Pretax gain/(loss) recognized in AOCI	$ (2,355)		$ (2,355)
Pretax gain/(loss) reclassified from AOCI into income, cash flow	$ 47		$ 47
Income Statement Location	Interest Expense		Interest Expense
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	$ (1,986)		$ (1,986)
Income Statement Location	Foreign Exchange Gain/(Loss)		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	$ (3,314)	$ (400)	$ (1,845)	$ 3,336
Income Statement Location	Gain or (loss) on sale of subsidiary		Gain or (loss) on sale of subsidiary