Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 54,376	$ 76,237	$ 144,732	$ 224,281
Unrealized gain (loss) on derivatives designated and qualified as cash flow hedges, net of income tax (expense) benefit of ($0.1) million, ($0.1) million, $0.3 million and $7.1 million, respectively	212	90	(461)	(11,292)
Reclassification of unrealized loss (gain) on expired derivatives designated and qualified as cash flow hedges, net of income tax benefit (expense) of $0.3 million, ($0.1) million, $0.6 million and ($0.2) million, respectively	556	(235)	934	(264)
Unrecognized net pension and other postretirement benefit gain (loss), net of income tax (expense) benefit of ($0.6) million, $0.2 million, ($0.1) million and ($0.2) million, respectively	1,918	(672)	438	393
Reclassification of net pension and other postretirement benefit loss, net of income tax benefit of $1.4 million, $0.7 million, $4.1 million and $2.2 million, respectively	2,392	1,291	7,227	3,864
Foreign currency translation adjustments, net of income tax benefit (expense) of $19.5 million, ($17.2) million, ($3.6) million and $42.8 million, respectively	(34,258)	28,603	4,187	(72,138)
Total comprehensive income	25,196	105,314	157,057	144,844
Comprehensive income attributable to noncontrolling interests	145	1,323	2,656	850
Comprehensive income attributable to Kennametal Shareowners	$ 25,051	$ 103,991	$ 154,401	$ 143,994