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Investments in Unconsolidated Affiliates - Financial Results of Four Largest Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Investments In And Advances To Affiliates [Line Items]      
Net sales $ 5,242,219 $ 3,171,429 $ 3,059,119
Gross margin (loss) 714,816 639,078 443,337
Net earnings (loss) 399,264 741,450 84,444
Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 3,268,842 1,918,477 1,819,996
Gross margin (loss) 808,599 438,558 376,930
Operating income (loss) 636,224 310,600 223,521
Depreciation and amortization 32,094 34,988 30,519
Interest expense 10,442 12,284 13,992
Income tax expense (benefit) 26,739 11,960 3,453
Net earnings (loss) 605,017 293,186 259,450
WAVE | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 452,368 371,814 368,820
Gross margin (loss) 238,523 215,692 208,040
Operating income (loss) 183,545 165,381 166,404
Depreciation and amortization 4,554 4,073 4,032
Interest expense 8,386 8,909 11,061
Income tax expense (benefit) 158 200 216
Net earnings (loss) [1] 175,154 156,869 202,451
ClarkDietrich | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 1,695,808 893,371 855,994
Gross margin (loss) 431,070 158,074 131,619
Operating income (loss) 351,583 94,888 66,952
Depreciation and amortization 10,946 11,917 11,869
Interest expense 308 101 378
Net earnings (loss) 356,288 98,313 68,899
Serviacero Worthington | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 620,312 311,543 273,276
Gross margin (loss) 96,918 51,253 15,739
Operating income (loss) 87,342 43,075 7,513
Depreciation and amortization 4,300 4,305 4,324
Interest expense 180 42 87
Income tax expense (benefit) 25,079 11,341 3,267
Net earnings (loss) 59,565 31,865 2,573
ArtiFlex | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 187,089 144,834 175,428
Gross margin (loss) 30,633 20,596 14,212
Operating income (loss) 15,778 9,628 6,248
Depreciation and amortization 5,708 5,728 5,605
Interest expense 340 528 801
Income tax expense (benefit) 258 149 (15)
Net earnings (loss) 15,180 8,950 5,461
Workhorse | Equity Method Investment, Nonconsolidated Investee, Other      
Investments In And Advances To Affiliates [Line Items]      
Net sales 313,265 196,915 146,478
Gross margin (loss) 11,455 (7,057) 7,320
Operating income (loss) (2,024) (2,372) (23,596)
Depreciation and amortization 6,586 8,965 4,689
Interest expense 1,228 2,704 1,665
Income tax expense (benefit) 1,244 270 (15)
Net earnings (loss) $ (1,170) $ (2,811) $ (19,934)
[1] On September 30, 2019, WAVE completed the sale of its international operations to Knauf Ceilings and Holdings GmbH (“Knauf”), as part of the broader transaction between Knauf and Armstrong World Industries, Inc., our partner in the WAVE joint venture. The net earnings in this table include net income attributable to discontinued operations of $49,770,000 in fiscal 2020. All other amounts presented in the table above exclude the activity of the discontinued operations of WAVE.