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Amount of loss from impairment of right-of-use asset from operating lease.

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Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
	Nov. 01, 2019	Aug. 31, 2019	May 31, 2019	Aug. 31, 2018	May 31, 2019	Nov. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of ROU assets		$ 4,843
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets estimated fair value			$ 11,938		$ 11,938	$ 13,623
Fair Value, Nonrecurring \| CNG fuel system facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets estimated fair value			238		238
Impairment charge			2,167
Nisshin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of ownership interest held in unconsolidated affiliates						10.00%
Impairment charge		$ 4,236			4,017
Nisshin \| Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets estimated fair value			3,700		3,700
Worthington Aritas \| Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets estimated fair value				$ 7,000
Impairment charge				$ 2,381
Worthington Specialty Processing \| Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets estimated fair value			1,000		$ 1,000
Impairment charge			$ 3,269
Noncontrolling Interest \| Nisshin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of ownership interest held in unconsolidated affiliates		10.00%	10.00%		10.00%
Engineered Cabs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of ROU assets		$ 905
Engineered Cabs \| Noncontrolling Interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percent of ownership interest held in unconsolidated affiliates	20.00%
Fair value of acquisition date	$ 13,623
Engineered Cabs Paint Line
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charge		1,469
Impairment of ROU assets		$ 3,938