Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022	May 31, 2023	Jun. 08, 2021
Related Party Transaction [Line Items]
Selling, general and administrative expense	$ 54.1	$ 50.7	$ 107.9	$ 98.0
Net sales	808.0	868.4	1,713.8	1,943.0
Current maturities of long-term debt due to Worthington Enterprises, Inc.	20.0		20.0		$ 20.0
Interest expense	0.2	0.9	0.7	2.2
Parent
Related Party Transaction [Line Items]
Selling, general and administrative expense	19.5	17.8	38.5	32.1
Net sales	19.3	$ 26.4	43.8	$ 62.1
TWB Term Loan
Related Party Transaction [Line Items]
Current maturities of long-term debt due to Worthington Enterprises, Inc.	20.0		20.0		20.0
Debt, interest rate						5.00%
TWB Term Loan | Parent
Related Party Transaction [Line Items]
Current maturities of long-term debt due to Worthington Enterprises, Inc.	$ 20.0		$ 20.0		$ 20.0
Debt, interest rate	5.00%	5.00%	5.00%	5.00%
Interest expense	$ 0.2	$ 0.4	$ 0.5	$ 0.9