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

Equity and Long-Term Incentive Compensation Plans - Cash-Based Long-Term Incentive Compensation (Details) - Cash long-term incentive plan $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) Installment	Mar. 31, 2017 USD ($)
Cash Long-Term Incentive Plan
Cash-based long-term incentive plan, granted amount			$ 5.9	$ 51.6
Cash long-term incentive plan, compensation expense	$ 11.6	$ 11.3	37.9	$ 34.7
Cash long-term incentive plan, unrecognized compensation balance	$ 91.4		$ 91.4
Minimum
Cash Long-Term Incentive Plan
Cash long-term incentive plan, equal vesting installments \| Installment			3
Cash long-term incentive plan, percentage of equal vesting installments			33.33%
Cash long-term incentive plan, vesting period			3 years
Maximum
Cash Long-Term Incentive Plan
Cash long-term incentive plan, equal vesting installments \| Installment			4
Cash long-term incentive plan, percentage of equal vesting installments			25.00%
Cash long-term incentive plan, vesting period			4 years