Stock-Based Compensation - Summary of Service-Based Restricted Common Shares (Detail) - Service-Based Restricted Common 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	800
Converted to Worthington Steel common shares	(296)	[1]
Separation related adjustment	220
Granted	214
Vested	(337)
Forfeited	(20)
Outstanding, Ending Balance	581
Weighted Average Grant Date Fair Value
Outstanding, Beginning Balance | $ / shares	$ 47.39
Converted to Worthington Steel common shares | $ / shares	55.7	[1]
Granted | $ / shares	64.57
Vested | $ / shares	39.17
Forfeited | $ / shares	47.07
Outstanding, Ending Balance | $ / shares	$ 36.34

[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.