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

Stock Repurchase Program (Details) - USD ($) shares in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Feb. 20, 2019	Feb. 19, 2019
Equity, Class of Treasury Stock
Total cost of repurchases	$ 206,017,000	$ 242,401,000	$ 307,787,000	$ 83,435,000			$ 756,204,000	$ 165,078,000
Other current liabilities
Equity, Class of Treasury Stock
Total cost of repurchases							$ 6,000,000
Common Stock and Capital in Excess of Par Value, Shares
Equity, Class of Treasury Stock
Number of shares of common stock repurchased (in shares)	1,770	2,556	2,781	796	388	433	7,107	1,618
Common Stock and Capital in Excess of Par Value, Shares \| Other current liabilities
Equity, Class of Treasury Stock
Number of shares of common stock repurchased (in shares)							100
New repurchase program
Equity, Class of Treasury Stock
Shares authorized to be repurchased, amount									$ 2,000,000,000	$ 1,000,000,000.00
Remaining shares authorized to be repurchased, amount	$ 1,210,000,000						$ 1,210,000,000