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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Feb. 28, 2025	Feb. 28, 2025	Feb. 29, 2024	May 31, 2024
Investments in and Advances to Affiliates [Line Items]
Investments in unconsolidated affiliates	$ 131,800,000	$ 131,800,000		$ 144,863,000
Excess dividends received from investing activity	$ 0		$ 1,085,000
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	25.00%	25.00%
Sustainable Energy Solutions
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	49.00%	49.00%
WAVE
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	50.00%	50.00%
Investments in unconsolidated affiliates	$ 110,402,000	$ 110,402,000		$ 111,905,000
Workhorse
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates	20.00%	20.00%
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Distributions from unconsolidated affiliates		$ 112,939,000