v3.26.1
Acquisitions - Additional Information (Detail)
€ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Jun. 03, 2025
USD ($)
Jun. 03, 2025
EUR (€)
Nov. 16, 2023
USD ($)
May 31, 2026
USD ($)
May 31, 2025
USD ($)
May 31, 2024
USD ($)
May 31, 2026
EUR (€)
Jan. 30, 2026
€ / shares
Jun. 03, 2025
EUR (€)
Business Acquisition [Line Items]                  
Goodwill       $ 44.5 $ 79.6 $ 79.6      
Pension liability adjustment       (4.0) 1.1 (2.4)      
Cash consideration for acquired entity, net of cash acquired       2.9 0.0 21.0      
Net sales       3,443.8 3,093.3 3,430.6      
Net earnings (loss)       (12.9) 119.3 $ 170.1      
Kloeckner                  
Business Acquisition [Line Items]                  
Cash consideration | € / shares               € 11  
Acquisition-related expenses       35.8          
Sitem Group                  
Business Acquisition [Line Items]                  
Percentage of acquisition 52.00%               52.00%
Date of acquisition Jun. 03, 2025 Jun. 03, 2025              
Business acquisition, name of acquired entity Sitem Group Sitem Group              
The total purchase price, cash consideration for stock acquired from shareholders $ 48.9               € 43.1
Contingent capital contribution cash 11.3 € 10.0   0.3          
Cash capital contribution attributable to minority interest 5.4 4.8              
Business combination contribution from subsidiary       12.0          
Contingent consideration cash 4.7 4.2   2.6          
Contingent Consideration - Cash newly issued shares 0.7 0.6              
Contingent consideration cash not yet paid       1.4     € 1.2    
Difference between contributed fair value and nonontrolling interest 0.7                
Acquisition-related expenses 5.4     $ 0.8 $ 4.6        
One time bonus paid to key individuals 4.6 4.0              
Deferred tax asset adjustment $ 0.8 € 0.7              
Fair value of remaining NCI percentage 48.00% 48.00%   48.00%          
Total - Redeemable NCI $ (81.8)     $ (79.9)          
Redeemable noncontrolling interest related to cash capital contribution and the contribution of Tempel Nagold 17.4                
Net cash consideration       64.2          
Property, plant and equipment       98.8          
Goodwill 17.5     17.5          
Sitem Group | Net Put/Call                  
Business Acquisition [Line Items]                  
Net put/call value 10.7               € 9.4
Sitem Group | Tempel Nagold                  
Business Acquisition [Line Items]                  
Business combination contribution from subsidiary 25.0 € 22.0              
Business combination contribution from subsidiary, attributable to minority interest 12.0 € 10.6              
Final purchase accounting adjustment amount $ 1.9                
Net sales       186.8          
Net earnings (loss)       $ (41.2)          
Voestalpine Automotive Components Nagold GmbH & Co. KG                  
Business Acquisition [Line Items]                  
Date of acquisition     Nov. 16, 2023            
Business acquisition, name of acquired entity     Voestalpine Nagold            
Net cash consideration     $ 21.0            
Pension liability     0.9            
Property, plant and equipment     12.3            
Net working capital     9.0            
Goodwill     0.6            
Purchase accounting adjustments, property, plant and equipment     0.3            
Purchase accounting adjustments, net working capital     (0.8)            
Purchase accounting adjustments, goodwill     0.5            
Pension liability adjustment     0.0            
Voestalpine Automotive Components Nagold GmbH & Co. KG | Property, Plant and Equipment                  
Business Acquisition [Line Items]                  
Purchase consideration, net     12.6            
Voestalpine Automotive Components Nagold GmbH & Co. KG | Net Working Capital                  
Business Acquisition [Line Items]                  
Purchase consideration, net     8.2            
Voestalpine Automotive Components Nagold GmbH & Co. KG | Goodwill                  
Business Acquisition [Line Items]                  
Purchase consideration, net     $ 1.1