Derivative Instruments and Hedging Activities - Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ (394)	$ 35	$ (6,369)	$ (4,495)
Gain (Loss) Reclassified from AOCI into Income	(3,193)	879	(9,859)	4,942
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(394)	35	(6,043)	(4,495)
Commodity Contracts | Cost of Sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(3,464)	931	(9,984)	5,039
Interest Rate Contract
Derivative [Line Items]
Gain (Loss) Recognized in OCI			(326)
Interest Rate Contract | Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	$ 271	(41)	144	(122)
Foreign Currency Exchange Contracts | Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income		$ (11)	$ (19)	$ 25