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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended				9 Months Ended
	Nov. 01, 2019	Sep. 30, 2020	Feb. 28, 2021	Aug. 31, 2020	Feb. 29, 2020	Aug. 31, 2019	Feb. 28, 2021	Feb. 29, 2020	Nov. 30, 2020	May 31, 2020	Dec. 31, 2019	Dec. 19, 2019
Investments in and Advances to Affiliates [Line Items]
Impairment of goodwill and long-lived assets			$ 0	$ 13,739,000	$ 34,627,000		$ 13,739,000	$ 75,228,000
Distributions from unconsolidated affiliates							65,502,000
Distributions in excess of investment in unconsolidated affiliate			$ 104,391,000				$ 104,391,000			$ 103,837,000
Proceeds from Sale of Equity Method Investments		$ 2,950,000
Samuel Joint Venture \| Joint Venture Transactions
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates									63.00%
Additional ownership interest acquired in joint venture											31.75%
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%
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%
Impairment of goodwill and long-lived assets						$ 35,194,000
Net gain on deconsolidation	$ 258,000
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			$ 104,391,000				$ 104,391,000
Nisshin
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates												10.00%
Impairment of goodwill and long-lived assets						$ 4,236,000