v3.26.1
Description of Business, The Separation, and Basis of Presentation - Additional Information (Detail)
$ in Millions
12 Months Ended
Jun. 03, 2025
May 31, 2026
USD ($)
Facility
Jointventure
Segment
May 31, 2025
USD ($)
May 31, 2024
USD ($)
Dec. 01, 2023
USD ($)
Significant Accounting Policies [Line Items]          
Number of years of service   70 years      
Cash distribution made as part of spinoff         $ 150.0
Cash and cash equivalents received as contribution of assets and liabilities         $ 3.8
Separation costs   $ 0.0 $ 0.0 $ 19.5  
Number of operating joint ventures | Jointventure   5      
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      
Number of facilities operated | Facility   14      
Allowance for credit losses increase (decrease)   $ (2.7)      
Receivables, allowances   1.1 3.8    
Depreciation Expenses   73.1 59.4 58.5  
Advertising Expenses   $ 0.4 $ 1.0 $ 0.8  
Sitem Group          
Significant Accounting Policies [Line Items]          
Fair value of remaining NCI percentage 48.00% 48.00%      
Ownership interest 52.00%        
Percentage of capital stock issued and outstanding 52.00%        
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage   20.00%      
Joint Venture Transactions          
Significant Accounting Policies [Line Items]          
Number of operating joint ventures | Jointventure   4      
Number of facilities operated | Facility   23      
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%      
WSCP | Joint Venture Transactions          
Significant Accounting Policies [Line Items]          
Percent of controlling interest by the Company   63.00%      
Sitem Group | Joint Venture Transactions          
Significant Accounting Policies [Line Items]          
Percent of controlling interest by the Company   52.00%      
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