Description of Business, The Separation, Agreements with the Former Parent and Separation Costs, and Basis of Presentation - Additional Information (Detail)	12 Months Ended
	May 31, 2024 USD ($) Facility Jointventure	May 31, 2023 USD ($)	May 31, 2022 USD ($) Jointventure	Dec. 01, 2023 USD ($)	Jun. 08, 2021
Significant Accounting Policies [Line Items]
Number of years of service	70 years
Percentage of pro rata distribution common shares	100.00%
Cash distribution made as part of spinoff				$ 150,000,000
Cash and cash equivalents received as contribution of assets and liabilities				$ 3,800,000
Separation costs	$ 19,500,000	$ 17,500,000	$ 0
Number of operating joint ventures | Jointventure			4
Derivative financial instruments, credit losses	$ 0
Number of facilities operated | Facility	15
Allowance for doubtful accounts increase (decrease)	$ 600,000
Receivables, allowances	3,200,000	2,600,000
Depreciation Expenses	58,500,000	62,700,000	$ 54,200,000
Advertising Expenses	$ 800,000	$ 1,200,000	$ 600,000
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk percentage	21.00%
Automotive Industries | Sales Revenue, Net | Product Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk percentage	52.00%	50.00%	48.00%
One Automotive Customer | Sales Revenue, Net | Product Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk percentage	14.60%	16.20%	17.00%
Joint Venture Transactions
Significant Accounting Policies [Line Items]
Number of operating joint ventures | Jointventure	3
Number of facilities operated | Facility	17
Serviacero Worthington
Significant Accounting Policies [Line Items]
Percent of ownership own a noncontrolling interest held in unconsolidated joint venture	50.00%
Spartan | Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	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%
WSP | Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	51.00%
Minimum
Significant Accounting Policies [Line Items]
Period allowed for payment of dues to customers	30 days
Maximum
Significant Accounting Policies [Line Items]
Period allowed for payment of dues to customers	60 days
Building and Building Improvements | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	10 years
Building and Building Improvements | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	40 years
Machinery and Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	3 years
Machinery and Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	20 years