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SEGMENT REPORTING AND GEOGRAPHIC INFORMATION - Additional Information (Details) - segment | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting and Geographic Information |  |  |  |
Number of reportable segments |  |  | 4 |
Semiconductor Process Control |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Number of operating segments |  |  | 2 |
Specialty Semiconductor Process |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Number of operating segments |  |  | 1 |
PCB, Display and Component Inspection |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Number of operating segments |  |  | 2 |
Other |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Number of operating segments |  |  | 1 |
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Customer One |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Concentration risk, percentage | 14.00% | 24.00% | 14.00% | 21.00%
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Customer Two |  |  |  |
Segment Reporting and Geographic Information |  |  |  |
Concentration risk, percentage |  | 10.00% | 13.00% | 11.00%

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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