Investments - Schedule of Financial Information of Unconsolidated Affiliates (Parenthetical) (Detail) $ in Millions	9 Months Ended
Feb. 28, 2025 USD ($)
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Distribution paid in cash	$ 35.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration