Stock-Based Compensation - Summary of Non-Vested Stock Option Awards (Detail) - $ / shares shares in Thousands		12 Months Ended
		May 31, 2024	May 31, 2023	May 31, 2022
Number of Stock Options
Non-vested, beginning of year		155
Converted to Worthington Steel common shares	[1]	(36)
Separation related adjustment		50
Granted		58	84	55
Vested		(100)
Forfeited		(7)
Non-vested, end of year		120	155
Weighted Average Grant Date Fair Value Per Common Share
Non-vested, beginning of year		$ 13.66
Converted to Worthington Steel common shares	[1]	20.9
Granted		25.61
Vested		14.29
Forfeited		18.4
Non-vested, end of year		$ 13.78	$ 13.66

[1] Effective as of the Distribution, each outstanding stock option held by a then-current or former employee or service provider of Worthington Steel was converted into a stock option denominated in the common shares of Worthington Steel.