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Investments in Unconsolidated Affiliates - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 19, 2019
Nov. 01, 2019
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2020
USD ($)
Entity
May 31, 2020
USD ($)
Entity
Feb. 29, 2020
USD ($)
[1]
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
[1]
May 31, 2020
USD ($)
Entity
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2019
Nov. 30, 2019
USD ($)
Investments In And Advances To Affiliates [Line Items]                            
Investments in unconsolidated affiliates       $ 203,329 $ 203,329     $ 214,930   $ 203,329 $ 214,930      
Impairment charge         7,462 [1] $ 34,627 $ 40,601 [1] 5,436 [1] $ 2,381 82,690 7,817 $ 61,208    
Estimated fair value of investments       2,800 2,800         2,800        
Distributions from unconsolidated affiliates                   122,953 161,079 $ 89,787    
Distributions in excess of investment in unconsolidated affiliate       $ 103,837 $ 103,837     121,948   103,837 121,948      
Proceeds from sale of equity method investments                   $ 2,950        
Number of largest unconsolidated affiliates | Entity       4 4         4        
Consolidated retained earnings undistributed earnings net of tax       $ 39,995 $ 39,995     46,838   $ 39,995 46,838      
Samuel Joint Venture | Joint Venture Transactions                            
Investments In And Advances To Affiliates [Line Items]                            
Percent of ownership interest held in unconsolidated affiliates       63.00% 63.00%         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% 50.00%         50.00%        
Distributions in excess of investment in unconsolidated affiliate       $ 103,837 $ 103,837     121,948   $ 103,837 121,948      
Pre-tax gain realized on deconsolidation of net-assets     $ 46,238                      
Pre-tax gain realized from the transaction     $ 23,119                      
Proceeds from sale of equity method investments       $ 10,000           $ 5,900        
ArtiFlex                            
Investments In And Advances To Affiliates [Line Items]                            
Percent of ownership interest held in unconsolidated affiliates       50.00% 50.00%         50.00%        
Investments in unconsolidated affiliates                           $ 54,566
ClarkDietrich                            
Investments In And Advances To Affiliates [Line Items]                            
Percent of ownership interest held in unconsolidated affiliates       25.00% 25.00%         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% 20.00%         20.00%        
Pre-tax gain realized on deconsolidation of net-assets   $ 437                        
Serviacero Worthington                            
Investments In And Advances To Affiliates [Line Items]                            
Percent of ownership interest held in unconsolidated affiliates       50.00% 50.00%         50.00%        
Nisshin                            
Investments In And Advances To Affiliates [Line Items]                            
Impairment charge             $ 4,236 4,017            
Estimated fair value of investments               $ 3,700     $ 3,700      
Ownership interest in unconsolidated affiliates agreed to be transferred 10.00%                          
[1]

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