CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (370,961)	$ 162,198	$ 206,916
Unrealized gain (loss) on derivatives designated and qualified as cash flow hedges	6,652	(706)	(611)
Reclassification of unrealized (gain) loss on expired derivatives designated and qualified as cash flow hedges	(2,873)	1,987	1,377
Unrecognized net pension and other postretirement benefit (loss) gain	(47,982)	(11,990)	39,376
Reclassification of net pension and other postretirement benefit loss	2,931	2,184	9,679
Foreign currency translation adjustments	(139,465)	31,763	9,223
Other comprehensive (loss) income, net of tax	(180,737)	23,238	59,044
Total comprehensive (loss) income	(551,698)	185,436	265,960
Less: comprehensive (loss) income attributable to noncontrolling interests	410	(4,198)	(3,101)
Comprehensive (loss) income attributable to Kennametal Shareholders	$ (551,288)	$ 181,238	$ 262,859