Derivative Financial Instruments and Hedging Activities - Schedule of Loss Recognized in Earnings for Economic (Non-Designated) Derivative Financial Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
May 31, 2024	May 31, 2023
Derivative [Line Items]
Loss Recognized in Earnings	$ (0.4)	$ (11.7)
Commodity Contracts \| Cost of Sales
Derivative [Line Items]
Loss Recognized in Earnings	(0.4)	(11.7)
Derivatives Not Designated As Hedging Instruments \| Commodity Contracts
Derivative [Line Items]
Loss Recognized in Earnings	$ 22.4	$ 2.4

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration