v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Mar. 31, 2018
Apr. 30, 2018
Document Information [Line Items]    
Entity Registrant Name KENNAMETAL INC.  
Entity Central Index Key 0000055242  
Current Fiscal Year End Date --06-30  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   81,628,262