Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022	Jun. 08, 2021
Related Party Transaction [Line Items]
Selling, general and administrative expense	$ 224,400,000	$ 200,800,000	$ 180,300,000
Net sales	3,430,600,000	3,607,700,000	4,068,900,000
Net transfers from (to) the former parent excluding distribution	150,000,000
Current maturities of long-term debt due to Worthington Enterprises, Inc.	0	20,000,000
Interest expense	6,000,000	3,000,000	3,000,000
Former Parent
Related Party Transaction [Line Items]
Selling, general and administrative expense	38,500,000	70,700,000	70,100,000
Net sales	82,100,000	109,800,000	135,600,000
Accounts receivable	9,700,000
Affiliate Companies
Related Party Transaction [Line Items]
Net sales	14,700,000	35,800,000	82,400,000
Accounts receivable	0	0
Purchases from affiliates	17,400,000	0	$ 9,700,000
Accounts payable	$ 0	0
TWB Term Loan
Related Party Transaction [Line Items]
Debt, interest rate				5.00%
TWB Term Loan | Former Parent
Related Party Transaction [Line Items]
Current maturities of long-term debt due to Worthington Enterprises, Inc.		20,000,000
Debt, interest rate	5.00%
Interest expense	$ 500,000	$ 1,400,000