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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2025	May 31, 2025
Investments in and Advances to Affiliates [Line Items]
Investments in unconsolidated affiliates	$ 129,678	$ 129,262
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	25.00%
Sustainable Energy Solutions
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	49.00%
WAVE
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	50.00%
Investments in unconsolidated affiliates	$ 103,166	$ 103,767
Workhorse
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	20.00%
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Distributions from unconsolidated affiliates	$ 36,476

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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