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BUSINESS COMBINATIONS - Fiscal 2019 Acquisitions (Details) shares in Billions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 24, 2020 USD ($) | Feb. 20, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) company | Aug. 22, 2019 USD ($) | Jun. 30, 2018 USD ($)
Business Acquisition |  |  |  |  |  |  |  |  |
Total purchase consideration | $ 11,400,000 |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 6,600,000 |  |  |
Goodwill adjustments |  |  |  |  |  | 34,134,000 | $ 38,216,000 |  |
Number of companies acquired | company |  |  |  |  |  |  | 5 |  |
Cash earn-out, maximum |  |  |  |  |  |  |  | $ 60,000,000.0 |
Goodwill |  |  |  |  | $ 2,211,858,000 | 2,045,402,000 | $ 2,211,858,000 |  | $ 354,698,000
Acquired goodwill | $ 2,200,000 |  |  |  |  | 56,180,000 | 1,818,951,000 |  |
Wafer Inspection and Patterning |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Goodwill adjustments |  |  |  |  |  | 166,000 | 0 |  |
Goodwill |  |  |  |  | 360,615,000 | 416,840,000 | 360,615,000 |  | $ 0
Acquired goodwill |  |  |  |  |  | 56,180,000 | 0 |  |
Orbotech |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Total purchase consideration |  | $ 3,260,000,000 |  |  |  |  |  |  |
Payment for acquisition |  | 1,700,000,000 |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 215,600,000 |  |  |  |  |  |  |
Shares of common stock issued in acquisition (in shares) | shares |  | 12.3 |  |  |  |  |  |  |
Fair value of KLA-Tencor common stock issued for outstanding Orbotech shares |  | $ 1,300,000,000 |  |  |  |  |  |  |
Stock options and RSUs assumed |  | 13,300,000 |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  |  |  | 388,900,000 |  |
Net loss of acquiree since acquisition |  |  |  |  |  |  | 61,600,000 |  |
Acquired intangible assets, adjustments |  |  |  | $ 2,100,000 | 75,500,000 |  |  |  |
Trade accounts receivable, adjustments |  |  |  |  | 21,500,000 |  |  |  |
Non-controlling interest, adjustments |  |  |  |  | 17,400,000 |  |  |  |
Other immaterial adjustments |  |  | $ 10,400,000 |  | 6,100,000 |  |  |  |
Impacts on deferred income tax liabilities, adjustments |  |  | 8,800,000 |  | 47,500,000 |  |  |  |
Additional reserves for uncertain tax positions, adjustments |  |  | $ 16,900,000 |  |  |  |  |  |
Goodwill adjustments |  |  |  |  |  | $ 34,000,000.0 | 38,200,000 |  |
Estimated fair value of the additional consideration |  | 73,057,000 |  |  |  |  |  |  |
Total assets acquired |  | 2,386,414,000 |  |  |  |  |  |  |
Goodwill |  | $ 1,845,728,000 |  |  |  |  |  |  |
Five privately-held companies |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Total purchase consideration |  |  |  |  |  |  | 133,700,000 |  |
Cash earn-out, maximum |  |  |  |  | 19,000,000.0 |  | 19,000,000.0 |  |
Estimated fair value of the additional consideration |  |  |  |  | 3,200,000 |  | 3,200,000 |  |
Total assets acquired |  |  |  |  | 13,200,000 |  | 13,200,000 |  |
Identified finite-lived intangible assets |  |  |  |  | 75,100,000 |  | 75,100,000 |  |
Goodwill |  |  |  |  | $ 45,400,000 |  | 45,400,000 |  |
Five privately-held companies | Wafer Inspection and Patterning |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  | 26,300,000 |  |
Five privately-held companies | GSS Reporting Unit |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  | 17,900,000 |  |
Five privately-held companies | Component Inspection Reporting Unit |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  | $ 1,200,000 |  |

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