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Segment Reporting and Geographic Information - Summary of Results for Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,258,435 | [1],[2] | $ 1,097,311 | [1],[2] | $ 1,119,898 | [1],[2] | $ 1,093,260 | [1],[2] | $ 1,070,004 | $ 1,021,294 | $ 975,822 | $ 969,581 | $ 4,568,904 | $ 4,036,701 | $ 3,480,014
Segment gross margin | $ 665,650 |  | $ 610,366 |  | $ 711,638 |  | $ 711,873 |  | $ 692,438 | $ 652,938 | $ 628,820 | $ 616,464 |  |  |
Operating segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,569,472 | 4,036,531 | 3,480,433
Segment gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 2,826,101 | 2,592,651 | 2,191,661
Operating segments | Semiconductor Process Control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,080,822 | 3,944,015 | 3,408,876
Segment gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 2,590,434 | 2,554,223 | 2,160,747
Operating segments | Specialty Semiconductor Process |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 151,164 | 0 | 0
Segment gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 78,800 | 0 | 0
Operating segments | PCB, Display and Component Inspection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 332,810 | 92,516 | 71,557
Segment gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 155,765 | 38,428 | 30,914
Operating segments | Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting and Geographic Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 4,676 | 0 | 0
Segment gross margin |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,102 | $ 0 | $ 0
[1] | On February 20, 2019, we completed the acquisition of Orbotech for total consideration of approximately $3.26 billion. The operating results of Orbotech have been included in our Consolidated financial statements for the fiscal year ended June 30, 2019 from the Acquisition Date. For additional details, refer to Note 6 “Business Combinations” to our Consolidated Financial Statements.
[2] | On July 1, 2018, we adopted ASC 606 using the modified retrospective transition approach. Results for reporting periods beginning after June 30, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with the previous revenue guidance in ASC 605.

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