Stock-Based Compensation - Summary of Performance Activity (Detail) - Performance Shares shares in Thousands	9 Months Ended
	Feb. 29, 2024 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Beginning Balance	172
Converted to Worthington Steel common shares	(39)	[1]
Separation related adjustment	58
Granted	113
Vested	(131)
Forfeited	(25)
Outstanding, Ending Balance	148
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance | $ / shares	$ 46.37
Converted to Worthington Steel common shares | $ / shares	56.99	[1]
Granted | $ / shares	52.73
Vested | $ / shares	39.93
Forfeited | $ / shares	36.02
Outstanding, Ending Balance | $ / shares	$ 37.7

[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.