Worthington Steel Separation, Description of Business, and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2023 USD ($) Jointventure	Nov. 30, 2022 USD ($)	Nov. 30, 2023 USD ($) Jointventure	Nov. 30, 2022 USD ($)	Sep. 29, 2022 USD ($)
Significant Accounting Policies [Line Items]
Percentage of pro rata distribution common shares					100.00%
Cash distribution made as part of spinoff					$ 150.0
Separation costs	$ 14.9	$ 8.0	$ 18.5	$ 8.0
Number of years of service			70 years
Automotive Industries | Sales Revenue, Net | Product Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk percentage	52.00%	52.00%	53.00%	48.00%
One Automotive Customer | Sales Revenue, Net | Product Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk percentage	14.90%	16.60%	15.80%	15.50%
Joint Venture Transactions
Significant Accounting Policies [Line Items]
Number of joint ventures | Jointventure	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%
WSCP | Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	63.00%		63.00%
WSP | Joint Venture Transactions
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	51.00%		51.00%