| Segment Reporting and Geographic Information (Tables)
 | 3 Months Ended | 
| Sep. 30, 2019 | 
|---|
| Segment Reporting [Abstract] |  | 
| Summary Of Results for Reportable Segments | 
The following is a summary of results for each of our four reportable segments for the indicated periods:
 
|  |  
|  |  |  |  |  |  |  |  |  
|   | Three Months Ended September 30, |  
| (In thousands) | 2019 |   | 2018 |  
| Semiconductor Process Control: |   |   |   |  
| Revenue | $ | 1,163,632 | 
 |   | $ | 1,069,959 | 
 |  
| Segment gross margin | $ | 742,342 | 
 |   | $ | 702,231 | 
 |  
| Specialty Semiconductor Process: |   |   |   |  
| Revenue | $ | 69,139 | 
 |   | $ | — | 
 |  
| Segment gross margin | $ | 38,164 | 
 |   | $ | — | 
 |  
| PCB, Display and Component Inspection: |   |   |   |  
| Revenue | $ | 178,552 | 
 |   | $ | 23,615 | 
 |  
| Segment gross margin | $ | 76,068 | 
 |   | $ | 10,533 | 
 |  
| Other: |   |   |   |  
| Revenue | $ | 2,231 | 
 |   | $ | — | 
 |  
| Segment gross margin | $ | 653 | 
 |   | $ | — | 
 |  
| Totals: |   |   |   |  
| Revenue | $ | 1,413,554 | 
 |   | $ | 1,093,574 | 
 |  
| Segment gross margin | $ | 857,227 | 
 |   | $ | 712,764 | 
 | 
 | 
| Reconciliation of Total Reportable Segments Revenue to Total Revenue | 
The following table reconciles total reportable segment revenue to total revenue for the indicated periods:
|  |  
|  |  |  |  |  |  |  |  |  
|   | Three Months Ended September 30, |  
| (In thousands) | 2019 |   | 2018 |  
| Total revenue for reportable segments | $ | 1,413,554 | 
 |   | $ | 1,093,574 | 
 |  
| Corporate allocations and effects of foreign exchange rates | (140 | ) |   | (314 | ) |  
| Total revenue | $ | 1,413,414 | 
 |   | $ | 1,093,260 | 
 | 
 | 
| Reconciliation of Total Segment Gross Margin to Total Income Before Income Taxes | 
The following table reconciles total segment gross margin to total income before income taxes for the indicated periods:
|  |  
|  |  |  |  |  |  |  |  |  
|   | Three Months Ended September 30, |  
| (In thousands) | 2019 |   | 2018 |  
| Total segment gross margin  | $ | 857,227 | 
 |   | $ | 712,764 | 
 |  
| 
Acquisition-related charges, corporate allocations, and effects of foreign exchange rates(1)
 | 48,054 | 
 |   | 891 | 
 |  
| Research and development | 210,580 | 
 |   | 153,530 | 
 |  
| Selling, general and administrative | 188,345 | 
 |   | 114,438 | 
 |  
| Interest expense | 40,350 | 
 |   | 26,362 | 
 |  
| Other expense (income), net | (1,618 | ) |   | (10,025 | ) |  
| Income before income taxes | $ | 371,516 | 
 |   | $ | 427,568 | 
 |  __________________ (1) Acquisition-related charges primarily include amortization of intangible assets, amortization of inventory fair value adjustments, and other acquisition-related costs classified or presented as part of costs of revenues.  | 
| Revenues by Geographic Region | The following is a summary of revenues by geographic region, based on ship-to location, for the indicated periods: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| (Dollar amounts in thousands) | Three Months Ended September 30, |  
| 2019 |   | 2018 |  
| Revenues: |   |   |   |   |   |   |   |  
| Taiwan | $ | 386,729 | 
 |   | 27 | % |   | $ | 254,437 | 
 |   | 23 | % |  
| China | 345,856 | 
 |   | 24 | % |   | 340,134 | 
 |   | 31 | % |  
| Japan | 206,211 | 
 |   | 15 | % |   | 135,578 | 
 |   | 12 | % |  
| Korea | 197,450 | 
 |   | 14 | % |   | 153,501 | 
 |   | 14 | % |  
| North America | 181,983 | 
 |   | 13 | % |   | 102,129 | 
 |   | 9 | % |  
| Europe and Israel | 59,383 | 
 |   | 4 | % |   | 71,669 | 
 |   | 7 | % |  
| Rest of Asia | 35,802 | 
 |   | 3 | % |   | 35,812 | 
 |   | 4 | % |  
| Total | $ | 1,413,414 | 
 |   | 100 | % |   | $ | 1,093,260 | 
 |   | 100 | % | 
 | 
| Revenues by Major Products | The following is a summary of revenues by major products for the indicated periods: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| (Dollar amounts in thousands) | Three Months Ended September 30, |  
| 2019 |   | 2018 |  
| Revenues: |   |   |   |   |   |   |   |  
| Wafer Inspection | $ | 448,274 | 
 |   | 32 | % |   | $ | 447,292 | 
 |   | 41 | % |  
| Patterning | 382,658 | 
 |   | 27 | % |   | 304,001 | 
 |   | 28 | % |  
| Specialty Semiconductor Process | 56,870 | 
 |   | 4 | % |   | — | 
 |   | — | % |  
| PCB, Display and Component Inspection | 120,360 | 
 |   | 9 | % |   | 20,835 | 
 |   | 2 | % |  
| Services | 355,439 | 
 |   | 25 | % |   | 264,033 | 
 |   | 24 | % |  
| Other | 49,813 | 
 |   | 3 | % |   | 57,099 | 
 |   | 5 | % |  
| Total | $ | 1,413,414 | 
 |   | 100 | % |   | $ | 1,093,260 | 
 |   | 100 | % | 
 | 
| Long-Lived Assets by Geographic Region | by geographic region as of the dates indicated below were as follows: 
|  |  
|  |  |  |  |  |  |  |  |  
| (In thousands) | As of September 30, 2019
 |   | As of June 30, 2019
 |  
| Land, property and equipment, net: |   |   |   |  
| United States | $ | 279,293 | 
 |   | $ | 253,255 | 
 |  
| Singapore | 52,778 | 
 |   | 49,523 | 
 |  
| Israel | 63,250 | 
 |   | 66,082 | 
 |  
| Europe | 61,302 | 
 |   | 62,027 | 
 |  
| Rest of Asia | 18,587 | 
 |   | 17,912 | 
 |  
| Total | $ | 475,210 | 
 |   | $ | 448,799 | 
 | 
 |