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 amount of current assets reported by an equity method investment of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Sep. 30, 2018	Aug. 31, 2018	May 31, 2018
Investments in and Advances to Affiliates [Line Items]
Distributions from unconsolidated affiliates		$ 19,989,000
Distributions in excess of investment in unconsolidated affiliate		$ 52,133,000	$ 55,198,000
ArtiFlex
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		25.00%
Samuel Steel Pickling Company
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		31.25%
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%
WAVE
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%
Distributions in excess of investment in unconsolidated affiliate		$ 52,133,000
Proceeds from sale of equity method investments		90,000,000
Receivables within current assets		$ 70,000,000
WAVE \| Subsequent Event
Investments in and Advances to Affiliates [Line Items]
Proceeds from sale of equity method investments	$ 70,000,000
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%