Document and Entity Information - USD ($)	12 Months Ended
	May 31, 2021	Jul. 23, 2021	Nov. 30, 2020
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	May 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Trading Symbol	WOR
Entity Registrant Name	WORTHINGTON INDUSTRIES, INC
Entity Central Index Key	0000108516
Current Fiscal Year End Date	--05-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Shares, Without Par Value
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		51,741,899
Entity Public Float			$ 1,793,568,865
Entity File Number	1-8399
Entity Incorporation, State or Country Code	OH
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
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	Selected portions of the Registrant’s definitive Proxy Statement to be furnished to shareholders of the Registrant in connection with the Annual Meeting of Shareholders to be held on September 29, 2021, are incorporated by reference into Part III of this Report to the extent provided therein.
Amendment Description	Worthington Industries, Inc. (“Worthington Industries”) hereby amends its Annual Report on Form 10-K for the fiscal year ended May 31, 2021, filed with the Securities and Exchange Commission (the “SEC”) on July 30, 2021 (the “Form 10-K”), as set forth in this Annual Report on Form 10-K/A (Amendment No. 1) (this “Form 10-K/A”). This Form 10-K/A is being filed solely to modify hyperlinks within the Index to Exhibits to include the “Consent of Independent Registered Public Accounting Firm” as Exhibit 23.1 and the “Consent of Independent Auditors” as Exhibit 23.2.  The inclusion of the “Consent of Independent Registered Public Accounting Firm” does not affect the report of KPMG LLP dated July 30, 2021, with respect to the consolidated financial statements and financial statement schedule II of Worthington Industries and the effectiveness of internal control over financial reporting included in the Form 10-K.  The inclusion of the “Consent of Independent Auditors” as Exhibit 23.2 does not affect the report of KPMG LLP dated February 16, 2021, with respect to the consolidated financial statements of Worthington Armstrong Venture and its subsidiaries. This Form 10-K/A also includes currently-dated certifications by Worthington Industries’ Principal Executive Officer and Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and Rule 13a-14(a)/15d-14(a) under the Securities Exchange Act of 1934, as amended, in addition to the Exhibit 23.1 and the Exhibit 23.2 referred to above.  Accordingly, Part IV, Item 15 of the Form 10-K is amended to reflect the filing of these exhibits. No other changes are being made to the Form 10-K by means of this Form 10-K/A.  This Form 10-K/A does not reflect subsequent events occurring after the original filing date of the Form 10-K or update in any way disclosures made in the Form 10-K other than as described above.  This Form 10-K/A should be read in conjunction with Worthington Industries’ filings with the SEC subsequent to the filing of the Form 10-K.