Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2016	Jul. 29, 2016	Dec. 31, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	KENNAMETAL INC
Entity Central Index Key	0000055242
Document Type	10-K
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,033,300,000
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		79,700,981