Document and Entity Information - shares	6 Months Ended
	Nov. 30, 2025	Jan. 06, 2026
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 30, 2025
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q2
Document Quarterly Report	true
Document Transition Report	false
Trading Symbol	WS
Entity Registrant Name	WORTHINGTON STEEL, INC.
Entity Central Index Key	0001968487
Current Fiscal Year End Date	--05-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Incorporation, State or Country Code	OH
Entity Shell Company	false
Entity File Number	001-41830
Entity Tax Identification Number	92-2632000
Entity Address, Address Line One	100 W. Old Wilson Bridge Road
Entity Address, City or Town	Columbus
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43085
City Area Code	614
Local Phone Number	840-3462
Entity Common Stock, Shares Outstanding		50,805,635
Title of 12(b) Security	Common Shares, Without Par Value
Security Exchange Name	NYSE