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Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income (Loss) Per Share | The following table sets forth the computation of basic and diluted net income per share attributable to KLA-Tencor
(In thousands, except per share amounts) | Three months ended March 31, |  | Nine months ended March 31,
2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net income attributable to KLA-Tencor | $ | 192,728 |  |  | $ | 306,881 |  |  | $ | 957,772 |  |  | $ | 453,498 |
Denominator: |  |  |  |  |  |  |
Weighted-average shares-basic, excluding unvested restricted stock units | 156,349 |  |  | 156,221 |  |  | 154,561 |  |  | 156,547 |
Effect of dilutive restricted stock units and options | 833 |  |  | 980 |  |  | 749 |  |  | 992 |
Weighted-average shares-diluted | 157,182 |  |  | 157,201 |  |  | 155,310 |  |  | 157,539 |
Basic net income per share attributable to KLA-Tencor | $ | 1.23 |  |  | $ | 1.96 |  |  | $ | 6.20 |  |  | $ | 2.90 |
Diluted net income per share attributable to KLA-Tencor | $ | 1.23 |  |  | $ | 1.95 |  |  | $ | 6.17 |  |  | $ | 2.88 |
Anti-dilutive securities excluded from the computation of diluted net income per share | 100 |  |  | — |  |  | 313 |  |  | 2 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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