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. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	$ 35	$ 2,450	$ (4,495)	$ 11,362
Gain (Loss) Reclassified from AOCI (Effective Portion)	879	3,161	4,942	12,575
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	35	2,429	(4,495)	8,243
Commodity Contracts | Cost of Sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	931	3,195	5,039	13,000
Interest Rate Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)		21		3,119
Interest Rate Contracts | Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	(41)	$ (34)	(122)	$ (425)
Foreign Currency Exchange Contracts | Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ (11)		$ 25