Amount of gain (loss) from remeasurement to fair value of retained investment in former subsidiary and group of assets constituting business or nonprofit activity deconsolidated and derecognized, excluding conveyance of oil and gas mineral rights and transfer of product or service in contract with customer.

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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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Basis of Presentation - Additional Information (Detail) $ in Thousands		3 Months Ended			6 Months Ended
	Nov. 01, 2019 USD ($)	Nov. 30, 2019 USD ($) Entity	Aug. 31, 2019 USD ($)	Nov. 30, 2018 USD ($)	Nov. 30, 2019 USD ($) Entity	Nov. 30, 2018 USD ($)
Significant Accounting Policies [Line Items]
Impairment of long-lived assets		$ 0		$ 0	$ 40,601	$ 2,381
Engineered Cabs
Significant Accounting Policies [Line Items]
Impairment of long-lived assets			$ 35,194
Cabs Joint Venture
Significant Accounting Policies [Line Items]
Percent of ownership interest held in unconsolidated affiliates	20.00%	20.00%			20.00%
Net gain on deconsolidation	$ 50
Joint Venture Transactions
Significant Accounting Policies [Line Items]
Number of joint ventures \| Entity		3			3
Spartan \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		52.00%			52.00%
TWB \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		55.00%			55.00%
Worthington Specialty Processing \| Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company		51.00%			51.00%