Investments - Summary of Equity Securities (Detail) - USD ($) $ in Millions	May 31, 2026	May 31, 2025
Investments in and Advances to Affiliates [Line Items]
Equity securities	$ 122.2	$ 0.0
Kloeckner
Investments in and Advances to Affiliates [Line Items]
Equity securities	$ 122.2	$ 0.0

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant