v3.26.1
Equity and Mezzanine Equity - Additional Information (Detail)
 12 Months Ended
Jun. 03, 2025
Option
Nov. 30, 2023
shares
May 31, 2026
USD ($)
shares
May 31, 2025
USD ($)
shares
May 31, 2024
USD ($)
shares
Feb. 28, 2023
shares
Class of Stock [Line Items]            
Repurchases and retirement of common shares (in shares)     0 0 0  
Deferred compensation obligation credited to common share option | $     $ 200,000   $ 0  
Equity method investment ownership percentage retained     0.00%      
Preferred shares, shares authorized     1,000,000 1,000,000    
Preferred shares, shares issued     0 0    
Preferred shares, shares outstanding     0 0    
Common shares, authorized     150,000,000 150,000,000   100
Common shares, shares issued     49,920,298 49,548,895   100
Common shares, shares outstanding     49,920,298 49,548,895   100
Stock split description     The Amendment (1) effected a stock split of the 100 then-outstanding common shares of Worthington Steel to provide a sufficient capitalization for the Former Parent to complete the pro rata distribution of 100% of Worthington Steel’s outstanding common shares to Former Parent’s shareholders, with each Former Parent shareholder as of November 21, 2023 (the “Record Date”) receiving one common share of Worthington Steel for every one common share of the Former Parent held as of the Record Date, and (2) eliminated Worthington Steel’s stated capital. On November 30, 2023, Worthington Steel distributed 49.3 million outstanding common shares to the Former Parent.      
Percentage of pro rata distribution common shares     100.00%      
Issuance of shares due to stock split   49,300,000        
Shares outstanding due to stock split   49,300,000        
Authorized distribution amount | $     $ 9,000,000      
Shortfall recovery authorized distribution amount | $     4,300,000      
Remaining income shortfall | $     5,500,000      
Remaining cash shortfall | $     $ 1,600,000      
Spartan            
Class of Stock [Line Items]            
Ownership percentage upon full recovery of the shortfall     52.00%      
Spartan | Minority Interest Owner            
Class of Stock [Line Items]            
Percentage of noncontrolling interest     48.00%      
NCI            
Class of Stock [Line Items]            
Shortfall recovery amount | $     $ 5,900,000      
Sitem Group Purchase Agreement | Call Option            
Class of Stock [Line Items]            
Percentage of Shares that can be Sold 48.00%          
Number of put/call options | Option 2          
Sitem Group Purchase Agreement | Put Option            
Class of Stock [Line Items]            
Percentage of Shares that can be Sold 48.00%          
Number of put/call options | Option 2          
Maximum            
Class of Stock [Line Items]            
Deferred compensation obligation credited to common share option | $       $ 100,000    
Maximum | Sitem Group Purchase Agreement | Call Option            
Class of Stock [Line Items]            
Percentage of Shares that can be Sold 100.00%          
Maximum | Sitem Group Purchase Agreement | Put Option            
Class of Stock [Line Items]            
Percentage of Shares that can be Sold 100.00%