Stock-Based Compensation - Summary of Activity for Service-Based Restricted Common Shares (Detail) - Service-Based Restricted Common Shares - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		May 31, 2024	May 31, 2023	May 31, 2022
Restricted Common Shares
Outstanding, beginning of year		800	650	777
Converted to Worthington Steel common shares	[1]	(296)
Separation related adjustment		220
Granted		218	358	192
Vested		(345)	(184)	(295)
Forfeited		(22)	(24)	(24)
Outstanding, end of year		575	800	650
Weighted Average Grant Date Fair Value
Outstanding, beginning of year		$ 47.39	$ 44.12	$ 40.36
Converted to Worthington Steel common shares	[1]	51.46
Granted		64.45	49.89	57.19
Vested		39.22	40.52	42.9
Forfeited		45.65	48.94	42.36
Outstanding, end of year		$ 36.43	$ 47.39	$ 44.12
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life of outstanding restricted common shares (in years)		1 year 1 month 17 days	1 year 3 months 10 days	1 year 3 months
Aggregate intrinsic value
Aggregate intrinsic value of outstanding restricted common shares		$ 32,783	$ 44,926	$ 30,283
Aggregate intrinsic value of restricted common shares vested during the year		$ 21,708	$ 8,897	$ 16,534

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