CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (223,884)	$ (370,961)	$ 162,198
Unrealized (loss) gain on derivatives designated and qualified as cash flow hedges	(150)	6,652	(706)
Reclassification of unrealized (gain) loss on expired derivatives designated and qualified as cash flow hedges	(1,563)	(2,873)	1,987
Unrecognized net pension and other postretirement benefit loss	(78,295)	(47,982)	(11,990)
Reclassification of net pension and other postretirement benefit loss	4,925	2,931	2,184
Foreign currency translation adjustments	(52,695)	(139,465)	31,763
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	15,088	0	0
Other comprehensive (loss) income, net of tax	(112,690)	(180,737)	23,238
Total comprehensive (loss) income	(336,574)	(551,698)	185,436
Less: comprehensive income (loss) attributable to noncontrolling interests	(896)	410	(4,198)
Comprehensive (loss) income attributable to Kennametal Shareholders	$ (337,470)	$ (551,288)	$ 181,238