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Cover - USD ($)
 12 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Dec. 31, 2019
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2020    
Document Transition Report false    
Entity File Number 1-5318    
Entity Registrant Name KENNAMETAL INC.    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 25-0900168    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 2,000,400,000
Documents Incorporated by Reference
Portions of the Proxy Statement for the 2020 Annual Meeting of Shareholders are incorporated by reference into Part III.
    
Entity Address, Address Line One 525 William Penn Place    
Entity Address, Address Line Two Suite 3300    
Entity Address, City or Town Pittsburgh,    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 15219    
City Area Code 412    
Local Phone Number 248-8000    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding (In shares)   82,927,634  
Entity Central Index Key 0000055242    
Current Fiscal Year End Date --06-30    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Capital Stock, par value $1.25 per share [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]      
Document Information [Line Items]      
Title of 12(b) Security Capital Stock, par value $1.25 per share    
Trading Symbol KMT    
Security Exchange Name NYSE    
Preferred Stock Purchase Rights [Member] | NEW YORK STOCK EXCHANGE, INC. [Member]      
Document Information [Line Items]      
Title of 12(b) Security Preferred Stock Purchase Rights    
Security Exchange Name NYSE    
No Trading Symbol Flag true