Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480095/942-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 942
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480035/942-10-S99-6

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-4

Description of Business and Basis of Presentation - Additional Information (Detail)		3 Months Ended			9 Months Ended
	Jun. 03, 2025	Feb. 28, 2026 USD ($) Jointventure	Nov. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)	Feb. 28, 2026 USD ($) Segment Jointventure	Feb. 28, 2025 USD ($)	May 31, 2025 USD ($)
Significant Accounting Policies [Line Items]
Impairment of assets		$ 1,500,000	$ 600,000	$ 7,400,000	$ 2,100,000	$ 7,400,000
Lowered net asset value			$ 500,000
Number of years of service					70 years
Number of operating segments \| Segment					1
Number of reportable segments \| Segment					1
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]					srt:ChiefExecutiveOfficerMember
Equity securities		$ 101,300,000		0	$ 101,300,000	0	$ 0
Sitem Group
Significant Accounting Policies [Line Items]
Percentage of capital stock issued and outstanding	52.00%
Joint Venture Transactions
Significant Accounting Policies [Line Items]
Number of operating joint ventures \| Jointventure		4			4
Serviacero Worthington
Significant Accounting Policies [Line Items]
Number of unconsolidated joint ventures \| Jointventure		1			1
Percent of ownership own a noncontrolling interest held in unconsolidated joint venture		50.00%			50.00%
Distributions from unconsolidated affiliates		$ 17,500,000		$ 7,800,000	$ 23,500,000	$ 12,800,000
Spartan \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		52.00%			52.00%
TWB \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		55.00%			55.00%
WSCP \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		63.00%			63.00%
WSP \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		51.00%			51.00%
Sitem Group \| Sitem Group
Significant Accounting Policies [Line Items]
Percentage of noncontrolling interest			48.00%
Sitem Group \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		52.00%			52.00%