KLA Corporation Quarterly report pursuant to Section 13 or 15(d)

Equity and Long-Term Incentive Compensation Plans - Cash Dividends (Details) - USD ($)					3 Months Ended
	Aug. 31, 2018	Aug. 02, 2018	Dec. 09, 2014	Nov. 19, 2014	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2014	Jun. 30, 2018
Dividends Payable
Cash dividends declared (in dollars per share)					$ 0.75	$ 0.59
Payment of dividends					$ 122,757,000	$ 100,327,000
Dividends payable					4,783,000	7,011,000
Regular cash dividend
Dividends Payable
Cash dividends declared (in dollars per share)		$ 0.75
Cash dividends paid per share (in dollars per share)	$ 0.75
Regular cash dividend \| Restricted stock unit, Performance-based and Service-based
Dividends Payable
Dividends payable					4,800,000			$ 6,700,000
Regular cash dividend \| Additional paid-in capital
Dividends Payable
Payment of dividends					119,900,000	94,100,000
Special cash dividend
Dividends Payable
Cash dividends declared (in dollars per share)				$ 16.50
Cash dividends paid per share (in dollars per share)			$ 16.50
Cash dividends paid							$ 2,760,000,000
Special cash dividend \| Restricted stock unit, Performance-based and Service-based
Dividends Payable
Dividends payable					37,500		$ 43,000,000	$ 2,800,000
Cash dividends paid					$ 2,800,000	$ 6,200,000