Derivative Instruments and Hedging Activities - Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
Aug. 31, 2020	Aug. 31, 2019
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 385	$ (5,659)
Gain (Loss) Reclassified from AOCI into Income	(2,868)	(2,334)
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	385	(5,659)
Commodity Contracts \| Cost of Sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(2,641)	(2,292)
Interest Rate Contract \| Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income	$ (227)	(120)
Foreign Currency Exchange Contracts \| Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI into Income		$ 78

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration