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Business Combinations - Orbotech Acquisition Additional Information (Details) - Orbotech - USD ($) |  | 3 Months Ended
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Feb. 20, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Business Acquisition |  |  |  |
Total purchase consideration |  | $ 3,255,558,000 |  |
Cash for outstanding Orbotech shares | [1] | 1,901,948,000 |  |
Fair value of KLA-Tencor common stock issued for outstanding Orbotech shares | [2] | 1,324,657,000 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |  |  |  |
Acquired intangible assets |  |  | $ 75,500,000 |
Trade accounts receivable |  |  | 21,500,000 |
Non-controlling interest |  |  | 17,400,000 |
Other immaterial adjustments |  |  | 6,100,000 |
Impacts on deferred income tax liabilities |  |  | 47,500,000 |
Increase to goodwill |  |  | $ 38,200,000 |
Goodwill deductible for income tax purposes |  | $ 0 |  |
Revenue of acquiree since acquisition |  |  |  | $ 388,900,000
Net loss of acquiree since acquisition |  |  |  | $ 61,600,000
[1] | Represents the total cash paid to settle 48.9 million outstanding Orbotech shares as of February 20, 2019 at $38.86 per Orbotech share.
[2] | Represents the fair value of 12.2 million shares of our common stock issued to settle 48.9 million outstanding Orbotech shares. KLA issued 0.25 shares for each Orbotech share. The fair value of KLA’s common stock was $108.26 per share on the Acquisition Date.

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