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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 19, 2019	Nov. 01, 2019	Sep. 30, 2019	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019	May 31, 2019	Dec. 31, 2019
Investments in and Advances to Affiliates [Line Items]
Impairment of goodwill and long-lived assets				$ 34,627			$ 0	$ 75,228	$ 2,381
Investments in unconsolidated affiliates				222,724				222,724		$ 214,930
Distributions from unconsolidated affiliates								78,321
Distributions in excess of investment in unconsolidated affiliate				$ 95,291				$ 95,291		121,948
Samuel Joint Venture \| Joint Venture Transactions
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates				63.00%				63.00%
Additional ownership interest acquired in joint venture											31.75%
Percent of controlling interest by the Company											31.25%
Nikola Corporation \| Minimum
Investments in and Advances to Affiliates [Line Items]
Percent of controlling interest by the Company				5.00%				5.00%
Nikola Corporation \| Maximum
Investments in and Advances to Affiliates [Line Items]
Percent of controlling interest by the Company				6.00%				6.00%
ArtiFlex
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates				50.00%				50.00%
Investments in unconsolidated affiliates				$ 54,566				$ 54,566
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates				25.00%				25.00%
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				$ 95,291				$ 95,291
Pre-tax gain realized from the transaction			$ 23,119
Pre-tax gain realized on deconsolidation of net-assets			$ 46,238
Reclassification of net earning to discontinued operation					$ 50,948			$ 50,948
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%
Pre-tax gain realized on deconsolidation of net-assets		$ 229
Nisshin
Investments in and Advances to Affiliates [Line Items]
Ownership interest in unconsolidated affiliates agreed to be transferred	10.00%
Impairment of goodwill and long-lived assets						$ 4,236				$ 4,017