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Investments in Unconsolidated Affiliates - Additional Information (Detail)
3 Months Ended 12 Months Ended
Dec. 19, 2019
Nov. 01, 2019
USD ($)
Nov. 30, 2020
USD ($)
[1]
Aug. 31, 2020
USD ($)
[1]
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
[1]
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
May 31, 2021
USD ($)
Entity
May 31, 2020
USD ($)
May 31, 2019
USD ($)
Dec. 31, 2019
Investments In And Advances To Affiliates [Line Items]                        
Impairment charge     $ 3,815,000 $ 9,924,000 $ 7,462,000 [1] $ 34,627,000 $ 40,601,000 [1]   $ 13,739,000 $ 82,690,000 $ 7,817,000  
Distributions from unconsolidated affiliates                 91,007,000 122,953,000 161,079,000  
Investments in unconsolidated affiliates         203,329,000       $ 233,126,000 203,329,000    
Number of largest unconsolidated affiliates | Entity                 4      
Consolidated retained earnings undistributed earnings net of tax         39,995,000       $ 59,015,000 39,995,000    
Samuel Joint Venture | Joint Venture Transactions                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates                 63.00%      
Additional ownership interest acquired in joint venture                       31.75%
WAVE                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates                 50.00%      
Investments in unconsolidated affiliates         $ 103,837,000       $ 99,669,000 $ 103,837,000    
ArtiFlex                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates                 50.00%      
ClarkDietrich                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates                 25.00%      
Cabs Joint Venture                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates   20.00%             20.00%      
Pre-tax gain realized on deconsolidation of net-assets   $ 437,000                    
Serviacero Worthington                        
Investments In And Advances To Affiliates [Line Items]                        
Percent of ownership interest held in unconsolidated affiliates                 50.00%      
Nisshin                        
Investments In And Advances To Affiliates [Line Items]                        
Impairment charge             $ 4,236,000 $ 4,017,000        
Estimated fair value of investments               $ 3,700,000     $ 3,700,000  
Ownership interest in unconsolidated affiliates agreed to be transferred 10.00%                      
[1]

For additional information regarding the Company’s impairment activity, refer to “Note E – Goodwill and Other Long-Lived Assets.”