Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (89,004)	$ (89,004)
Other comprehensive loss before reclassifications attributable to Kennametal	26,453
Other comprehensive loss before reclassifications	25,560
Amounts reclassified from accumulated other comprehensive loss	893
Net current period other comprehensive loss	26,267	25,890
Accumulated Other Comprehensive Income (Loss), Net of Tax	(62,551)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(83,937)
Other comprehensive loss before reclassifications attributable to Kennametal	(1,482)
Other comprehensive loss before reclassifications	(1,966)
Amounts reclassified from accumulated other comprehensive loss	484
Accumulated Other Comprehensive Income (Loss), Net of Tax	(85,419)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	7,414
Other comprehensive loss before reclassifications attributable to Kennametal	28,096
Other comprehensive loss before reclassifications	28,096
Accumulated Other Comprehensive Income (Loss), Net of Tax	35,510
Accumulated translation adjustment relating to noncontrolling interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	721
Other comprehensive loss before reclassifications	(186)
Net current period other comprehensive loss	(186)
Accumulated Other Comprehensive Income (Loss), Net of Tax	535
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(12,481)
Other comprehensive loss before reclassifications attributable to Kennametal	(161)
Other comprehensive loss before reclassifications	(570)
Amounts reclassified from accumulated other comprehensive loss	409
Accumulated Other Comprehensive Income (Loss), Net of Tax	(12,642)
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	721
Other comprehensive loss before reclassifications	(186)
Net current period other comprehensive loss	(186)	630
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 535