Derivative Instruments and Hedging Activities - Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 16,381	$ (316)	$ 16,765	$ (5,975)
Gain (Loss) Reclassified from AOCI into Income	(3,160)	(4,332)	(6,028)	(6,666)
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	16,381	10	16,765	(5,649)
Commodity Contracts | Cost of Sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(2,690)	(4,228)	(5,331)	(6,520)
Interest Rate Contract
Derivative [Line Items]
Gain (Loss) Recognized in OCI		(326)		(326)
Interest Rate Contract | Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	$ (470)	(7)	$ (697)	(127)
Foreign Currency Exchange Contracts
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income		$ (97)
Foreign Currency Exchange Contracts | Miscellaneous Income Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income				$ (19)