Derivative Instruments and Hedging Activities - Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
May 31, 2019	May 31, 2018
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	$ (12,637)	$ 14,983
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	3,590	13,627
Commodity Contracts \| Cost of Sales
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	(12,637)	11,620
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	3,752	14,034
Interest Rate Contracts \| Interest Expense
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)		3,363
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	$ (162)	$ (407)

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=114867106&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=109978405&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=114867106&loc=SL7669646-108580

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Balance Type:	credit
Period Type:	duration