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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Cumulative distributions from an equity method investee in excess of the entity's investment balance in the investee.

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Equity method investment financing transaction.

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Equity method investment one time special distributions.

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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Feb. 28, 2019	Feb. 28, 2019	May 31, 2018
Investments in and Advances to Affiliates [Line Items]
Distributions from unconsolidated affiliates			$ 131,888
Distributions in excess of investment in unconsolidated affiliate		$ 124,198	124,198	$ 55,198
Excess distributions from unconsolidated affiliates		$ 1,492	56,693
Proceeds from sale of equity method investments			$ 45,000
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%
Samuel Steel Pickling Company
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		31.25%	31.25%
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%
One-time special distributions			$ 60,000
Pending of sale related to international operations	$ 35,000		35,000
Financing transaction			25,000
Distributions in excess of investment in unconsolidated affiliate		$ 124,198	124,198
Excess distributions from unconsolidated affiliates			56,693
Proceeds from sale of equity method investments			$ 90,000
Zhejiang Nisshin Worthington Precision Specialty Steel Co
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		10.00%	10.00%