Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	$ 7,317	$ (10,411)	$ 8,050	$ (18,503)
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	5,270	(6,606)	4,915	(15,936)
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	7,157	(10,210)	124	(18,336)
Commodity Contracts \| Cost of Goods Sold
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	5,737	(6,460)	(570)	(15,647)
Interest Rate Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	160	(201)	7,926	(167)
Interest Rate Contracts \| Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)	$ (467)	$ (146)	$ 5,485	(285)
Foreign Currency Contracts \| Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated OCI (Effective Portion)				$ (4)

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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