Stock-Based Compensation - Summary of Performance Share Award Activity (Detail) - Performance Award Activity - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		May 31, 2024	May 31, 2023	May 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of year		172	160	177
Converted to Worthington Steel common shares	[1]	(39)
Separation related adjustment		59
Granted		116	118	67
Vested		(145)	(89)	(65)
Forfeited		(22)	(17)	(19)
Outstanding, end of year		141	172	160
Weighted Average Grant Date Fair Value
Outstanding, beginning of year		$ 46.37	$ 42.93	$ 39.23
Converted to Worthington Steel common shares	[1]	56.99
Granted		52.36	43.4	52.22
Vested		38.91	38.91	42.82
Forfeited		40.18	39.36	41.8
Outstanding, end of year		$ 37.55	$ 46.37	$ 42.93
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life of outstanding restricted common shares (in years)		1 year 5 months 4 days	1 year 7 months 2 days	10 months 24 days
Aggregate intrinsic value
Aggregate intrinsic value of outstanding restricted common shares		$ 8,014	$ 9,636	$ 7,445
Aggregate intrinsic value of restricted common shares vested during the year		$ 10,165	$ 4,056	$ 3,994

[1] Effective as of the Distribution, each performance share award held by an employee or director of Worthington Steel was converted into a restricted stock award covering Worthington Steel shares.