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Investments in Unconsolidated Affiliates - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
May 31, 2019
USD ($)
Entity
Aug. 31, 2018
USD ($)
[1]
May 31, 2018
USD ($)
Nov. 30, 2017
USD ($)
[1]
May 31, 2019
USD ($)
Entity
May 31, 2018
USD ($)
May 31, 2017
USD ($)
Investments in and Advances to Affiliates [Line Items]                  
Impairment charge     $ 5,436 [1] $ 2,381 $ 52,919 [1] $ 8,289 $ 7,817 $ 61,208  
Distributions from unconsolidated affiliates             161,079 89,787 $ 102,015
Distributions in excess of investment in unconsolidated affiliate     $ 121,948   55,198   121,948 55,198  
Proceeds from sale of equity method investments             $ 45,000    
Number of largest unconsolidated affiliates | Entity     4       4    
Consolidated retained earnings undistributed earnings net of tax     $ 46,838   42,636   $ 46,838 42,636  
ArtiFlex                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     50.00%       50.00%    
ClarkDietrich                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     25.00%       25.00%    
Samuel Steel Pickling Company                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     31.25%       31.25%    
Serviacero Worthington                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     50.00%       50.00%    
WAVE                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     50.00%       50.00%    
Distributions in excess of investment in unconsolidated affiliate     $ 121,948   $ 55,198   $ 121,948 $ 55,198  
Proceeds from sale of equity method investments             $ 90,000    
Pending of sale related to international operations   $ 35,000              
Financing transaction $ 25,000                
Zhejiang Nisshin Worthington Precision Specialty Steel Co                  
Investments in and Advances to Affiliates [Line Items]                  
Percent of ownership interest held in unconsolidated affiliates     10.00%       10.00%    
Impairment charge     $ 4,017       $ 4,017    
Estimated fair value of investments     $ 3,700       $ 3,700    
[1] For additional information regarding the Company’s impairment activity, refer to “Note D – Goodwill and Other Long-Lived Assets.”