KLA Corporation Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Derivative Instruments Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Derivative
Gains (losses) in accumulated OCI on derivatives (effective portion)	$ (1,934)	$ 10,138
Gains (losses) reclassified from accumulated OCI into income (effective portion)	3,846	3,222
Derivatives designated as hedging instruments
Derivative
Gains (losses) reclassified from accumulated OCI into income (effective portion)	3,846	3,222
Derivatives designated as hedging instruments \| Accumulated OCI
Derivative
Gains (losses) in accumulated OCI on derivatives (effective portion)	(1,934)	10,138
Derivatives designated as hedging instruments \| Revenues
Derivative
Gains (losses) reclassified from accumulated OCI into income (effective portion)	955	2,846
Derivatives designated as hedging instruments \| Costs of revenues
Derivative
Gains (losses) reclassified from accumulated OCI into income (effective portion)	2,137	(378)
Derivatives designated as hedging instruments \| Interest expense
Derivative
Gains (losses) reclassified from accumulated OCI into income (effective portion)	754	754
Derivatives designated as hedging instruments \| Other expense (income), net
Derivative
Net losses recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing)	(567)	(929)
Not Designated as Hedging Instrument \| Other expense (income), net
Derivative
Gains (losses) recognized in income	$ (2,311)	$ 7,318