Document and Entity Information - shares	3 Months Ended
	Aug. 31, 2020	Sep. 30, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Aug. 31, 2020
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Trading Symbol	WOR
Entity Registrant Name	WORTHINGTON INDUSTRIES, INC
Entity Central Index Key	0000108516
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	001-08399
Entity Tax Identification Number	31-1189815
Entity Address, Address Line One	200 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	438-3210
Entity Common Stock, Shares Outstanding		54,375,748
Title of 12(b) Security	Common Shares, Without Par Value
Security Exchange Name	NYSE